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US 9,432,164 B2Granted
Method and apparatus for reference signal sequence mapping in wireless communication
AssigneeQUALCOMM Incorporated
InventorsWanshi Chen, Peter Gaal, Juan Montojo, Tao Luo
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Abstract
A wireless communication method implemented in a multi-user, multi-input multi-output MU-MIMO system is disclosed which includes forming one or more antenna port sets, wherein an antenna port set comprises two or more antenna ports and allocating transmission resources to a user equipment reference signal UE-RS, the allocating being based at least in part on an antenna port set index.
Claims19
A wireless communication method implemented in a multi-input multi-output MIMO system, the system comprising:
- forming an antenna port set, wherein the antenna port set comprises a plurality of antenna ports that share a set of transmission resources;
- assigning an antenna port set index to a group of antennas of the plurality of antenna ports in the antenna port set;
- allocating transmission resources to a user equipment reference signal (UE-RS), the allocating being based at least in part on the antenna port set index, the allocating comprising mapping the UE-RS to the transmission resources, the mapping being a function of the antenna port set index, the UE-RS being scrambled using a pseudorandom UE-RS sequence, and the pseudo-random UE-RS sequence being initialized using an initialization sequence based at least in part on initializing the pseudo-random UE-RS sequence independent of the antenna port set index;
- and
- transmitting, by a base station, the UE-RS from the antenna ports in the antenna port set.
2 more elements
A wireless communication method implemented in a multi-input multi-output MIMO system, the method comprising:
- receiving an assignment of an antenna port set index associated with a group of antennas of a plurality of antenna ports of an antenna port set, wherein the plurality of antenna ports share a set of transmission resources;
- and
- receiving, by a user equipment (UE), a transmission of a user equipment reference signal (UE-RS), the transmission of the UE-RS being based at least in part on the antenna port set index, the UE-RS being mapped to the transmission resources as a function of the antenna port set index, the UE-RS being scrambled using a pseudo-random UE-RS sequence, and the pseudo-random UE-RS sequence being initialized using an initialization sequence based at least in part on an initialization of the pseudo-random UE-RS sequence independent of the antenna port set index.
A non-transitory computer-readable storage medium having program code recorded thereon, the program code comprising:
- program code to receive an assignment of an antenna port set index associated with a group of antennas of a plurality of antenna ports of an antenna port set, wherein the plurality of antenna ports share a set of transmission resources;
- and
- program code to receive a transmission of a user equipment reference signal (UE-RS), the transmission being based at least in part on the antenna port set index, the UE-RS being mapped to the transmission resources as a function of the antenna port set index, the UE-RS being scrambled using a pseudo-random UE-RS sequence, and the pseudo-random UE-RS sequence initialized using an initialization sequence based at least in part on an initialization of the pseudo-random UE-RS sequence independent of the antenna port set index.
A wireless communication apparatus for use in a multi-input multi-output MIMO system, the apparatus comprising:
- a memory unit;
- and
- at least one processor coupled to the memory unit, the at least one processor being configured:
- to receive an assignment of an antenna port set index associated with a group of antennas of a plurality of antenna ports of an antenna port set, wherein the plurality of antenna ports share a set of transmission resources;
- and
- to receive a transmission of a user equipment reference signal (UE-RS), the transmission being based at least in part on the antenna port set index, the UE-RS being mapped to the transmission resources as a function of the antenna port set index, the UE-RS being scrambled using the pseudo-random UE-RS sequence, and the pseudo-random UE-RS sequence being initialized using an initialization sequence based at least in part on an initialization of the pseudo-random UE-RS sequence independent of the antenna port set index.
3 more elements
A wireless communication method implemented in a multi-input multi-output MIMO system, the system comprising:
- forming an antenna port set, wherein the antenna port set comprises a plurality of antenna ports that share a set of transmission resources;
- assigning an antenna port set index to the plurality of antenna ports in the antenna port set;
- allocating transmission resources to a user equipment reference signal (UE-RS), the allocating being based at least in part on the antenna port set index, wherein the UE-RS is scrambled using a predetermined pseudo-random UE-RS sequence, the pseudo-random UE-RS sequence initialized using an initialization sequence;
- and
- initializing the pseudo-random UE-RS sequence that is independent of the antenna port set index, wherein the initializing the pseudo-random UE-RS sequence comprises initializing using:
- cinit=216·(7·(ns+1)+l+1)·(2·NIDServingCell+1)+C+2*NIDServingCell;
- in which cinit is the pseudo-random UE-RS sequence, ns is a slot number and l is an index of a symbol in which the UE-RS is to be transmitted, NIDServingCell is an identification of a serving cell, and C is a constant;
- and
- transmitting the UE-RS from the antenna ports in the antenna port set.
6 more elements
Dependencies are inferred from the claim text.