# US 8,787,304 B2 · Method for reference signal pattern allocation and related communication device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,787,304 B2 - Document ID: US8787304B2 - Status: Granted - Kind: B2 - Application number: 13/163,735 - Filed: 2011-06-20 - Published: 2011-12-22 - Granted: 2014-07-22 - Earliest claimed: 2010-06-22 - Assignees: Acer Incorporated - Applicants: Yan-Xiu Zheng; Chung-Lien Ho - Inventors: Yan-Xiu Zheng; Chung-Lien Ho - Web page: https://patentgrep.com/patent/US8787304B2 ## CPC - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04L 5/0016: {Time-frequency-code} - H04L 5/0023: {Time-frequency-space} - H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 27/2613: {Structure of the reference signals} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A method for reference signal pattern allocation for a eNodeB in a wireless communication system is disclosed. The method comprises allocating a plurality of physical resource blocks (PRBs) to at least one mobile device; and mapping a plurality of reference signal patterns to the PRBs according to a mapping rule. ## Claims ### Claim 1 A method for reference signal pattern allocation for an eNodeB in a wireless communication system, the method comprising: allocating a plurality of physical resource blocks (PRBs) to at least one mobile device; and mapping a plurality of reference signal patterns same as a plurality of orthogonal cover code (OCC) reference signal patterns multiplied with the associated demodulation reference signal to the PRBs according to an OCC mapping rule, wherein the OCC reference signal pattern applies length-2 or length-4Walsh code OCC mapping according to antenna port and the direction of length-2 or length-4 Walsh code OCC sequences are mapped forward, reverse and forward on 14 OFDM symbols in time domain and 12 subcarriers in frequency domain. ### Claim 2 (depends on 1) The method of claim 1, wherein the OCC reference signal pattern applies length-2 or length-4 Walsh code OCC mapping according to antenna port and the direction of length-2 or length-4 Walsh code OCC sequences are mapped forward, reverse and forward on 14 OFDM symbols in time domain and 12subcarriers in frequency domain. ### Claim 3 (depends on 2) The method of claim 2, wherein the demodulation reference signal is generated by a length-31 Gold sequence according to the index of the allocated resource block and initial value. ### Claim 4 (depends on 1) The method of claim 1, wherein the demodulation reference signal is generated by a length-31 Gold sequence according to the index of the allocated resource block and initial value. ### Claim 5 (depends on 1) The method of claim 1, wherein the mapping rule comprises mapping the plurality of reference signal patters to the plurality PRBs according to a plurality of index numbers of the plurality of PRBs when the mapping rule is cell-specific. ### Claim 6 (depends on 5) The method of claim 5 further comprising mapping a first reference signal pattern to odd PRBs of the plurality of PRBs and a second signal pattern to even PRBs of the plurality of PRBS, wherein the odd PRBs are assigned odd index number, the even PRBs are assigned even index number. ### Claim 7 (depends on 1) The method of claim 1, wherein the mapping rule comprises cyclically mapping the plurality of reference signal patters to PRBs of each mobile device in a PRB index order of the PRBs of each mobile device when the mapping rule is UE-specific. ### Claim 8 (depends on 7) The method of claim 7 further comprising: mapping a first reference signal pattern and a second reference signal pattern in turn to allocated PRBs for the first mobile device. ### Claim 9 (depends on 7) The method of claim 7 further comprising: mapping a first reference signal pattern and a second reference signal pattern in turn to first contiguously allocated PRBs for the first mobile device and mapping a second reference signal pattern and a first reference signal pattern in turn to second contiguously allocated PRBs for the first mobile device. ### Claim 10 (depends on 7) The method of claim 7 further comprising: mapping a first reference signal pattern and a second reference signal pattern in turn to first contiguously allocated PRBs for the first mobile device and mapping a first reference signal pattern and a second reference signal pattern in turn to second contiguously allocated PRBs for the first mobile device. ### Claim 11 (depends on 7) The method of claim 7 further comprising: switching a first reference signal pattern of a first PRB with a second reference signal pattern of a second PRB when a third reference signal pattern of a third PRB is the same as the first reference signal pattern of the first PRB and a fourth reference signal pattern of a fourth PRB is the same as the second reference signal pattern of the second PRB. ### Claim 12 (depends on 7) The method of claim 7 further comprising: switching at least one first reference signal pattern in a first PRB group with at least one second reference signal pattern in the first PRB group when all reference signal patterns in the first PRB group is arranged identically the same as the ones in a second PRB group, wherein the plurality of PRBs comprises PRBs of the first PRB group and PRB of the second PRB group. ### Claim 13 (depends on 1) The method of claim 1, wherein the mapping rule comprises cyclically mapping the plurality of reference signal patters to each of a plurality of PRB groups in a PRB index order of each of the plurality PRB groups when the mapping rule is UE-specific. ### Claim 14 (depends on 13) The method of claim 13 further comprising: mapping a first reference signal pattern to odd PRBs of a first PRB group and a second reference signal pattern to even PRBs of the first PRB group, wherein the odd PRBs of the first PRB group are assigned odd index numbers, the even PRBs of the first PRB group are assigned even index numbers; and mapping the first reference signal pattern to odd PRBs of a second PRB group and the second reference signal pattern to even PRBs of the second PRB group, wherein the odd PRBs of the second PRB group are assigned odd index number, the even PRBs of the second PRB group are assigned even index number; wherein, the plurality of PRB groups comprise the first PRB group and the second PRB group. ### Claim 15 (depends on 13) The method of claim 13 further comprising: mapping a first reference signal pattern to odd PRBs of a first PRB group and a second reference signal pattern to even PRBs of the first PRB group except for unused PRBs of the first PRB group, wherein the odd PRBs of the first PRB group are assigned odd index numbers, the even PRBs of the first PRB group are assigned even index numbers; and mapping the first reference signal pattern to odd PRBs of a second PRB group and the second reference signal pattern to even PRBs of the second PRB group except for unused PRBs of the second PRB group, wherein the odd PRBs of the second PRB group are assigned odd index number, the even PRBs of the second PRB group are assigned even index number; wherein, the plurality of PRB groups comprise the first PRB group and the second PRB group. ### Claim 16 (depends on 1) The method of claim 1, wherein the plurality of PRBs are all used or partially used. ### Claim 17 (depends on 1) The method of claim 1 further comprising bundling the plurality of PRBs into a plurality of PRB groups, the number of PRBs in each group is power of two. ### Claim 18 (depends on 17) The method of claim 17, wherein mapping the plurality of resource signal patterns to the PRBs according to the mapping rule comprises mapping at least one of the plurality of reference signal patterns to each PRB group. ### Claim 19 A communication device of handling reference signal pattern allocation in a wireless communication system, the communication device comprising: means for allocating a plurality of physical resource blocks (PRBs) to at least one mobile device; and means for mapping a plurality of reference signal patterns same as a plurality of OCC reference signal patterns multiplied with the associated DM RS signal to the PRBs according to an OCC mapping rule, wherein the reference signal pattern is the demodulation reference signals on 7 OFDM symbols in time domain and 12 subcarriers in frequency domain multiplied by length-2or length-4 Walsh code OCC mapping according to antenna port and the direction of length-2 or length-4 Walsh code OCC sequences are mapped reverse, forward and reverse on 14 OFDM symbols in time domain and 12subcarriers in frequency domain. ### Claim 20 (depends on 19) The communication device of claim 19 wherein the OCC reference signal pattern applies length-2 or length-4 Walsh code OCC mapping according to antenna port and the direction of length-2 or length-4 Walsh code OCC sequences are mapped forward, reverse and forward on 14 OFDM symbols in time domain and 12 subcarriers in frequency domain. ### Claim 21 (depends on 20) The communication device of claim 20, wherein the demodulation reference signal is generated by a length-31 Gold sequence according to the index of the allocated resource block and initial value. ### Claim 22 (depends on 19) The communication device of claim 19, wherein the demodulation reference signal is generated by a length-31 Gold sequence according to the index of the allocated resource block and initial value. ### Claim 23 (depends on 19) The communication device of claim 19, wherein the OCC mapping rule comprises mapping the plurality of reference signal patters to the plurality PRBs according to a plurality of index numbers of the plurality of PRBs when the OCC mapping rule is cell-specific. ### Claim 24 (depends on 23) The communication device of claim 23 further comprising means for mapping a first reference signal pattern to odd PRBs of the plurality of PRBs and a second signal pattern to even PRBs of the plurality of PRBS, wherein the odd PRBs are assigned odd index number, the even PRBs are assigned even index number. ### Claim 25 (depends on 19) The communication device of claim 19, wherein the OCC mapping rule comprises cyclically mapping the plurality of reference signal patters to all PRBs of each mobile device in an order of the index numbers when the OCC mapping rule is UE-specific. ### Claim 26 (depends on 25) The communication device of claim 25 further comprising: means for mapping a first reference signal pattern and a second reference signal pattern in turn to allocated PRBs for the first mobile device. ### Claim 27 (depends on 25) The communication device of claim 25 further comprising: means for mapping a first reference signal pattern and a second reference signal pattern in turn to first contiguously allocated PRBs for the first mobile device and mapping a second reference signal pattern and a first reference signal pattern in turn to second contiguously allocated PRBs for the first mobile device. ### Claim 28 (depends on 25) The communication device of claim 25 further comprising: means for mapping a first reference signal pattern and a second reference signal pattern in turn to first contiguously allocated PRBs for the first mobile device and mapping a first reference signal pattern and a second reference signal pattern in turn to second contiguously allocated PRBs for the first mobile device. ### Claim 29 (depends on 25) The communication device of claim 25 further comprising: means for switching a first reference signal pattern of a first PRB with a second reference signal pattern of a second PRB when a third reference signal pattern of a third PRB is the same as the first reference signal pattern of the first PRB and a fourth reference signal pattern of a fourth PRB is the same as the second reference signal pattern of the second PRB. ### Claim 30 (depends on 25) The communication device of claim 25 further comprising: means for switching at least one first reference signal pattern in a first PRB group with at least one second reference signal pattern in the first PRB group when all reference signal patterns in the first PRB group is arranged identically the same as the ones in a second PRB group, wherein the plurality of PRBs comprises PRBs of the first PRB group and PRB of the second PRB group. ### Claim 31 (depends on 19) The communication device of claim 19, wherein the OCC mapping rule comprises cyclically mapping the plurality of reference signal patters to each PRB group of each mobile device in an order of the index numbers when the OCC mapping rule is UE-specific. ### Claim 32 (depends on 31) The communication device of claim 31 further comprising: means for mapping a first reference signal pattern to odd PRBs of a first PRB group and a second reference signal pattern to even PRBs of the first PRB group, wherein the odd PRBs of the first PRB group are assigned odd index numbers, the even PRBs of the first PRB group are assigned even index numbers; and means for mapping the first reference signal pattern to odd PRBs of a second PRB group and the second reference signal pattern to even PRBs of the second PRB group, wherein the odd PRBs of the second PRB group are assigned odd index number, the even PRBs of the second PRB group are assigned even index number; wherein, the plurality of PRB groups comprise the first PRB group and the second PRB group. ### Claim 33 (depends on 31) The communication device of claim 31 further comprising: means for mapping a first reference signal pattern to odd PRBs of a first PRB group and a second reference signal pattern to even PRBs of the first PRB group except for unused PRBs of the first PRB group, wherein the odd PRBs of the first PRB group are assigned odd index numbers, the even PRBs of the first PRB group are assigned even index numbers; and means for mapping the first reference signal pattern to odd PRBs of a second PRB group and the second reference signal pattern to even PRBs of the second PRB group except for unused PRBs of the second PRB group, wherein the odd PRBs of the second PRB group are assigned odd index number, the even PRBs of the second PRB group are assigned even index number; Wherein, the plurality of PRB groups comprise the first PRB group and the second PRB group. ### Claim 34 (depends on 19) The communication device of claim 19, wherein the plurality of PRBs are all used or partially used. ### Claim 35 (depends on 19) The communication device of claim 19 further comprising means for bundling the plurality of PRBs into a plurality of PRB groups. ### Claim 36 (depends on 35) The communication device of claim 35, wherein means for mapping the plurality of resource signal patterns to the PRBs according to the OCC mapping rule maps at least one of the plurality of reference signal patterns to each PRB group. ### Claim 37 A method for reference signal pattern allocation for a mobile device in a wireless communication system, the method comprising: receiving a plurality of physical resource blocks (PRBs) to from a eNodeB; and using a plurality of reference signal patterns same as a plurality of OCC reference signal patterns multiplied with the associated DM RS signal on the received PRBs according to an OCC mapping rule, wherein the reference signal pattern is the demodulation reference signals on 7 OFDM symbols in time domain and 12 subcarriers in frequency domain multiplied by length-2 or length-4 Walsh code OCC mapping according to antenna port and the direction of length-2 or length-4 Walsh code OCC sequences are mapped reverse, forward and reverse on 14 OFDM symbols in time domain and 12subcarriers in frequency domain. ### Claim 38 (depends on 37) The method of claim 37, wherein the OCC reference signal pattern applies length-2 or length-4 Walsh code OCC mapping according to antenna port and the direction of length-2 or length-4 Walsh code OCC sequences are mapped forward, reverse and forward on 14 OFDM symbols in time domain and 12subcarriers in frequency domain. ### Claim 39 (depends on 38) The method of claim 38, wherein the demodulation reference signal is generated by a length-31 Gold sequence according to the index of the allocated resource block and initial value. ### Claim 40 (depends on 37) The method of claim 37, wherein the demodulation reference signal is generated by a length-31 Gold sequence according to the index of the allocated resource block and initial value. ### Claim 41 (depends on 37) The method of claim 37, wherein the OCC mapping rule comprises mapping the plurality of reference signal patters to the plurality PRBs according to a plurality of index numbers of the plurality of PRBs when the OCC mapping rule is cell-specific. ### Claim 42 (depends on 41) The method of claim 41 further comprising mapping a first reference signal pattern to odd PRBs of the plurality of PRBs and a second signal pattern to even PRBs of the plurality of PRBS, wherein the odd PRBs are assigned odd index number, the even PRBs are assigned even index number. ### Claim 43 (depends on 37) The method of claim 37, wherein the OCC mapping rule comprises cyclically mapping the plurality of reference signal patters to all PRBs of each mobile device in an order of the index numbers when the OCC mapping rule is UE-specific. ### Claim 44 (depends on 43) The method of claim 43 further comprising: mapping a first reference signal pattern and a second reference signal pattern in turn to allocated PRBs for the first mobile device. ### Claim 45 (depends on 43) The method of claim 43 further comprising: mapping a first reference signal pattern and a second reference signal pattern in turn to first contiguously allocated PRBs for the first mobile device and mapping a second reference signal pattern and a first reference signal pattern in turn to second contiguously allocated PRBs for the first mobile device. ### Claim 46 (depends on 43) The method of claim 43 further comprising: mapping a first reference signal pattern and a second reference signal pattern in turn to first contiguously allocated PRBs for the first mobile device and mapping a first reference signal pattern and a second reference signal pattern in turn to second contiguously allocated PRBs for the first mobile device. ### Claim 47 (depends on 43) The method of claim 43 further comprising: switching a first reference signal pattern of a first PRB with a second reference signal pattern of a second PRB when a third reference signal pattern of a third PRB is the same as the first reference signal pattern of the first PRB and a fourth reference signal pattern of a fourth PRB is the same as the second reference signal pattern of the second PRB. ### Claim 48 (depends on 43) The method of claim 43 further comprising: switching at least one first reference signal pattern in a first PRB group with at least one second reference signal pattern in the first PRB group when all reference signal patterns in the first PRB group is arranged identically the same as the ones in a second PRB group, wherein the plurality of PRBs comprises PRBs of the first PRB group and PRB of the second PRB group. ### Claim 49 (depends on 37) The method of claim 37, wherein the OCC mapping rule comprises cyclically mapping the plurality of reference signal patters to each PRB group of each mobile device in an order of the index numbers when the OCC mapping rule is UE-specific. ### Claim 50 (depends on 49) The method of claim 49 further comprising: mapping a first reference signal pattern to odd PRBs of a first PRB group and a second reference signal pattern to even PRBs of the first PRB group, wherein the odd PRBs of the first PRB group are assigned odd index numbers, the even PRBs of the first PRB group are assigned even index numbers; and mapping the first reference signal pattern to odd PRBs of a second PRB group and the second reference signal pattern to even PRBs of the second PRB group, wherein the odd PRBs of the second PRB group are assigned odd index number, the even PRBs of the second PRB group are assigned even index number; wherein, the plurality of PRB groups comprise the first PRB group and the second PRB group. ### Claim 51 (depends on 49) The method of claim 49 further comprising: mapping a first reference signal pattern to odd PRBs of a first PRB group and a second reference signal pattern to even PRBs of the first PRB group except for unused PRBs of the first PRB group, wherein the odd PRBs of the first PRB group are assigned odd index numbers, the even PRBs of the first PRB group are assigned even index numbers; and mapping the first reference signal pattern to odd PRBs of a second PRB group and the second reference signal pattern to even PRBs of the second PRB group except for unused PRBs of the second PRB group, wherein the odd PRBs of the second PRB group are assigned odd index number, the even PRBs of the second PRB group are assigned even index number; Wherein, the plurality of PRB groups comprise the first PRB group and the second PRB group. ### Claim 52 (depends on 37) The method of claim 37, wherein the plurality of PRBs are all used or partially used. ### Claim 53 (depends on 37) The method of claim 37, wherein the plurality of PRBs is buddle into a plurality of PRB groups. ### Claim 54 (depends on 53) The method of claim 53, wherein the OCC mapping rule comprises mapping at least one of the plurality of reference signal patterns to each PRB group. ### Claim 55 A communication device for reference signal pattern allocation for a mobile device in a wireless communication system, the communication device comprising: means for receiving a plurality of physical resource blocks (PRBs) to from a eNodeB; and means for using a plurality of reference signal patterns same as a plurality of OCC reference signal patterns multiplied with the associated DM RS signal to demodulate the PRBs according to an OCC mapping rule, wherein the reference signal pattern is the demodulation reference signals on 7 OFDM symbols in time domain and 12 subcarriers in frequency domain multiplied by length-2 or length-4 Walsh code OCC mapping according to antenna port and the direction of length-2 or length-4 Walsh code OCC sequences are mapped reverse, forward and reverse on 14 OFDM symbols in time domain and 12 subcarriers in frequency domain. ### Claim 56 (depends on 55) The communication device of claim 55, wherein the OCC reference signal pattern applies length-2 or length-4 Walsh code OCC mapping according to antenna port and the direction of length-2 or length-4 Walsh code OCC sequences are mapped forward, reverse and forward on 14 OFDM symbols in time domain and 12 subcarriers in frequency domain. ### Claim 57 (depends on 56) The communication device of claim 56, wherein the demodulation reference signal is generated by a length-31 Gold sequence according to the index of the allocated resource block and initial value. ### Claim 58 (depends on 55) The communication device of claim 55, wherein the demodulations reference signal is generated by a length-31 Gold sequence according to the index of the allocated resource block and the initial value. ### Claim 59 (depends on 55) The communication device of claim 55, wherein the OCC mapping rule comprises mapping the plurality of reference signal patters to the plurality PRBs according to a plurality of index numbers of the plurality of PRBs when the OCC mapping rule is cell-specific. ### Claim 60 (depends on 59) The communication device of claim 59 further comprising means for mapping a first reference signal pattern to odd PRBs of the plurality of PRBs and a second signal pattern to even PRBs of the plurality of PRBS, wherein the odd PRBs are assigned odd index number, the even PRBs are assigned even index number. ### Claim 61 (depends on 55) The communication device of claim 55, wherein the OCC mapping rule comprises cyclically mapping the plurality of reference signal patters to all PRBs of each mobile device in an order of the index numbers when the OCC mapping rule is UE-specific. ### Claim 62 (depends on 61) The communication device of claim 61 further comprising: means for mapping a first reference signal pattern and a second reference signal pattern in turn to allocated PRBs for the first mobile device. ### Claim 63 (depends on 61) The communication device of claim 61 further comprising: means for mapping a first reference signal pattern and a second reference signal pattern in turn to first contiguously allocated PRBs for the first mobile device and mapping a second reference signal pattern and a first reference signal pattern in turn to second contiguously allocated PRBs for the first mobile device. ### Claim 64 (depends on 61) The communication device of claim 61 further comprising: means for mapping a first reference signal pattern and a second reference signal pattern in turn to first contiguously allocated PRBs for the first mobile device and mapping a first reference signal pattern and a second reference signal pattern in turn to second contiguously allocated PRBs for the first mobile device. ### Claim 65 (depends on 61) The communication device of claim 61 further comprising: means for switching a first reference signal pattern of a first PRB with a second reference signal pattern of a second PRB when a third reference signal pattern of a third PRB is the same as the first reference signal pattern of the first PRB and a fourth reference signal pattern of a fourth PRB is the same as the second reference signal pattern of the second PRB. ### Claim 66 (depends on 61) The communication device of claim 61 further comprising: means for switching at least one first reference signal pattern in a first PRB group with at least one second reference signal pattern in the first PRB group when all reference signal patterns in the first PRB group is arranged identically the same as the ones in a second PRB group, wherein the plurality of PRBs comprises PRBs of the first PRB group and PRB of the second PRB group. ### Claim 67 (depends on 55) The communication device of claim 55, wherein the OCC mapping rule comprises cyclically mapping the plurality of reference signal patters to each PRB group of each mobile device in an order of the index numbers when the OCC mapping rule is UE-specific. ### Claim 68 (depends on 67) The communication device of claim 67 further comprising: means for mapping a first reference signal pattern to odd PRBs of a first PRB group and a second reference signal pattern to even PRBs of the first PRB group, wherein the odd PRBs of the first PRB group are assigned odd index numbers, the even PRBs of the first PRB group are assigned even index numbers; and means for mapping the first reference signal pattern to odd PRBs of a second PRB group and the second reference signal pattern to even PRBs of the second PRB group, wherein the odd PRBs of the second PRB group are assigned odd index number, the even PRBs of the second PRB group are assigned even index number; Wherein, the plurality of PRB groups comprise the first PRB group and the second PRB group. ### Claim 69 (depends on 67) The communication device of claim 67 further comprising: means for mapping a first reference signal pattern to odd PRBs of a first PRB group and a second reference signal pattern to even PRBs of the first PRB group except for unused PRBs of the first PRB group, wherein the odd PRBs of the first PRB group are assigned odd index numbers, the even PRBs of the first PRB group are assigned even index numbers; and means for mapping the first reference signal pattern to odd PRBs of a second PRB group and the second reference signal pattern to even PRBs of the second PRB group except for unused PRBs of the second PRB group, wherein the odd PRBs of the second PRB group are assigned odd index number, the even PRBs of the second PRB group are assigned even index number; Wherein, the plurality of PRB groups comprise the first PRB group and the second PRB group. ### Claim 70 (depends on 55) The communication device of claim 55, wherein the plurality of PRBs are all used or partially used. ### Claim 71 (depends on 55) The communication device of claim 55, wherein the plurality of PRBs is buddle into a plurality of PRB groups. ### Claim 72 (depends on 61) The communication device of claim 61, wherein the OCC mapping rule comprises mapping at least one of the plurality of reference signal patterns to each PRB group.