# US 8,787,491 B2 · Method and apparatus for generating reference signal > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,787,491 B2 - Document ID: US8787491B2 - Status: Granted - Kind: B2 - Application number: 13/633,630 - Filed: 2012-10-02 - Published: 2013-01-24 - Granted: 2014-07-22 - Earliest claimed: 2010-04-02 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Mingyu Zhou; Yuan Xia; Qiang Li; Zuomin Wu - Web page: https://patentgrep.com/patent/US8787491B2 ## CPC - H04J 13/0059: {CAZAC [constant-amplitude and zero auto-correlation]} - H04L 5/0016: {Time-frequency-code} - H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - H04W 72/542: using measured or perceived quality - H04L 5/0012: {Hopping in multicarrier systems} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract The disclosure discloses a method for generating a reference signal. The method includes: a user equipment receiving a first signaling carrying reference signal solution information sent by a base station, wherein the reference signal solution information has at least one mapping relation with at least one piece of orthogonal code configuration information and at least one hopping mode, and the at least one mapping relation is stored in the base station and the user equipment; determining a corresponding piece of orthogonal code configuration information and a corresponding hopping mode according to the received reference signal solution information and the stored at least one mapping relation; and generating a reference signal according to the determined piece of orthogonal code configuration information and the determined hopping mode. ## Claims ### Claim 1 A method for generating a reference signal, comprising: receiving, by a user equipment from a base station, a first signal carrying reference signal solution information, wherein the reference signal solution information has at least one mapping relation with at least one piece of orthogonal code configuration information and at least one hopping mode, wherein the at least one mapping relation is stored at the base station and at the user equipment; determining, by the user equipment, a corresponding piece of the orthogonal code configuration information and a corresponding hopping mode according to the received reference signal solution information and the stored at least one mapping relation; and generating, by the user equipment, a reference signal according to the determined piece of the orthogonal code configuration information and the determined hopping mode, wherein before receiving, by the user equipment, the first signal, the method further comprises: receiving, by the user equipment from the base station, a second signal indicating a quantity of data transmission layers; and wherein the determining, by the user equipment, the corresponding piece of the orthogonal code configuration information and the corresponding hopping mode according to the received reference signal solution information and the stored at least one mapping relation comprises: determining, by the user equipment, at least one corresponding mapping relation from the stored at least one mapping relation according to the quantity of data transmission layers; and determining, by the user equipment, the corresponding piece of the orthogonal code configuration information and the corresponding hopping mode according to the reference signal solution information and the at least one determined corresponding mapping relation determined according to the quantity of data transmission layers, wherein different data transmission layers use a single orthogonal cover code when the orthogonal code configuration information includes the orthogonal cover code. ### Claim 2 (depends on 1) The method of claim 1, wherein before receiving, by the user equipment, the first signal, the method further comprises: receiving, by the user equipment from the base station, a hopping-rule relevant parameter; and wherein the generating, by the user equipment, the reference signal according to the determined piece of the orthogonal code configuration information and the determined hopping mode comprises: generating, by the user equipment, the reference signal according to the hopping-rule relevant parameter, a hopping rule corresponding to the hopping mode, and the piece of the orthogonal code configuration information. ### Claim 3 (depends on 1) The method of claim 1, wherein before receiving, by the user equipment, the first signal, the method further comprises: storing a hopping-rule relevant parameter; and wherein the generating, by the user equipment, the reference signal according to the determined piece of the orthogonal code configuration information and the determined hopping mode comprises: generating, by the user equipment, the reference signal according to the hopping-rule relevant parameter, a hopping rule corresponding to the determined hopping mode, and the determined piece of orthogonal code configuration information. ### Claim 4 (depends on 1) The method of claim 1, wherein the reference signal solution information is sent by the base station through a channel for delivering relevant information on uplink scheduling. ### Claim 5 (depends on 1) The method of claim 1, wherein the orthogonal code configuration information comprises one of a group consisting of: an orthogonal code, a cyclic shift, and an orthogonal cover code. ### Claim 6 (depends on 1) The method of claim 1, wherein different hopping modes correspond to different hopping periods. ### Claim 7 (depends on 1) The method of claim 1, wherein the hopping mode comprises one of a group consisting of: a sequence group hopping mode and a cyclic shift hopping mode. ### Claim 8 (depends on 1) The method of claim 1, wherein the hopping mode comprises one of a group consisting of: a slot-level hopping mode and a subframe-level hopping mode. ### Claim 9 A user equipment, comprising: a memory, configured to store at least one mapping relation among at least one piece of reference signal solution information, at least one piece of orthogonal code configuration information, and at least one hopping mode; a receiver, configured to receive a signal carrying a piece of reference signal solution information sent by a base station; a processor, configured to determine a corresponding piece of the orthogonal code configuration information and a corresponding hopping mode according to the received piece of reference signal solution information and the stored at least one mapping relation; and a generator, configured to generate a reference signal according to the determined piece of the orthogonal code configuration information and the hopping mode, wherein the receiver is further configured to receive a second signal indicating a quantity of data transmission layers sent by the base station, wherein the processor is further configured to determine at least one corresponding mapping relation from the at least one mapping relation stored by the memory according to the quantity of the data transmission layers indicated by the second signal and determine the corresponding piece of the orthogonal code configuration information and the corresponding hopping mode according to the received reference signal solution information and the at least one determined corresponding mapping relation, wherein different data transmission layers use a single orthogonal cover code when the orthogonal code configuration information includes the orthogonal cover code. ### Claim 10 (depends on 9) The user equipment of claim 9, wherein the receiver is further configured to receive a hopping-rule relevant parameter sent by the base station, and wherein the generator is further configured to generate the reference signal according to the received hopping-rule relevant parameter, a hopping rule corresponding to the determined hopping mode, and the determined piece of the orthogonal code configuration information. ### Claim 11 (depends on 9) The user equipment of claim 9, wherein the memory is further configured to store a hopping-rule relevant parameter, wherein the generator is further configured to generate the reference signal according to the stored hopping-rule relevant parameter, a hopping rule corresponding to the determined hopping mode and the determined piece of the orthogonal code configuration information. ### Claim 12 A method for generating a reference signal, comprising: storing, by a base station, at least one mapping relation among at least one piece of reference signal solution information, at least one piece of orthogonal code configuration information, and at least one hopping mode; and sending, by the base station, a first signal carrying a piece of reference signal solution information of the at least one piece of reference signal solution information to a user equipment to enable the user equipment to determine a corresponding piece of the orthogonal code configuration information and a corresponding hopping mode according to the reference signal solution information sent by the base station and at least one corresponding mapping relation from the at least one mapping relation stored by the user equipment, and to generate the reference signal according to the determined piece of the orthogonal code configuration information and the determined hopping mode, wherein before sending by the base station the first signal the method further comprises: sending by the base station a second signal indicating a quantity of data transmission layers to the user to enable the user equipment to determine the at least one corresponding mapping relation from the at least one mapping relation stored in the user equipment according to the indicated quantity of the data transmission layers, wherein different data transmission layers use a single orthogonal cover code when the orthogonal code configuration information includes the orthogonal cover code. ### Claim 13 (depends on 12) The method of claim 12, wherein before sending, by the base station, the first signal, the method further comprises: sending, by the base station, a hopping-rule relevant parameter to the user equipment, to enable the user equipment to generate the reference signal according to the hopping-rule relevant parameter, a hopping rule corresponding to the determined hopping mode, and the determined piece of the orthogonal configuration solution information. ### Claim 14 A base station, comprising: a memory, configured to store at least one mapping relation among at least one piece of reference signal solution information, at least one piece of orthogonal code configuration information, and at least one hopping mode; and a transmitter, configured to send a first signal carrying a piece of reference signal solution information of the at least one piece of reference signal solution information, to a user equipment to enable the user equipment to determine a corresponding piece of the orthogonal code configuration information and a corresponding hopping mode according to the reference signal solution information sent by the base station and at least one corresponding mapping relation from the at least one mapping relation stored by the user equipment, and to generate a reference signal according to the determined piece of the orthogonal code configuration information and the determined hopping mode, wherein the transmitter is further configured to send a second signal indicating a quantity of data transmission layers to the user equipment to enable the user equipment to determine the at least one corresponding mapping relation from the at least one mapping relation stored in the user equipment according to the indicated quantity of the data transmission layers, wherein different data transmission layers use a single orthogonal cover code when the orthogonal code configuration information includes the orthogonal cover code. ### Claim 15 (depends on 14) The base station of claim 14, wherein the transmitter is further configured to send a hopping-rule relevant parameter to the user equipment to enable the user equipment to generate the reference signal according to the hopping-rule relevant parameter, a hopping rule corresponding to the determined hopping mode, and the determined piece of the orthogonal code configuration information.