Channel quality reporting in a wireless communication system

摘要

In one aspect, a method performed by a user equipment, UE, in a wireless telecommunication system is provided. The UE is configured in multiple input multiple output, MIMO, mode with four transmit antennas. The method includes: transmitting a type A channel status report, CSR, to a network node in a radio access network of the wireless telecommunication system, wherein the type A CSR identifies a first rank; and transmitting a type B CSR to the network node, wherein the type B CSR identifies a second rank, characterized in that the second rank is limited to one of 1, 2, and 3.

主权项

1. A method performed by a user equipment (UE) in a wireless telecommunication system, the UE being configured in multiple input multiple output (MIMO) mode with four transmit antennas, the method comprising:
transmitting a type A channel status report, CSR, to a network node in a radio access network of the wireless telecommunication system, wherein the type A CSR identifies a first rank selected from a first set of ranks; and transmitting a type B CSR to the network node, wherein the type B CSR identifies a second rank, wherein the second rank is selected from a second set of ranks, said second set of ranks having fewer ranks than the first set of ranks, wherein the method further comprises: A) prior to transmitting the type A CSR:
Ai) selecting a first rank from said first set of ranks based on a first estimated channel condition;Aii) calculating a first channel quality indicator, CQI, value based on, at least in part, the selected first rank; andAiii) including the first CQI value in the type A CSR; and B) prior to transmitting the type B CSR, determining whether a predetermined number of type A CSRs have been transmitted since the last type B CSR was transmitted and, as a result of determining that the predetermined number of type A CSRs have been transmitted since the last type B CSR was transmitted, performing the following steps:
Bi) selecting a second rank from said second set of ranks based on a second estimated channel condition;Bii) calculating a second CQI value based on, at least in part the selected second rank; andBiii) including the second CQI value in the type B CSR.