Method for half-duplex FDD operation in LTE FDD network

摘要

A method and apparatus for half-duplex (HD) frequency division duplex (FDD) (HD-FDD) operation are disclosed. The method in a wireless transmit/receive unit (WTRU) includes monitoring a first frequency for all downlink sub-frames for downlink communication except during a cell specific uplink frame, retuning to a second frequency and transmitting a scheduling request (SR) during a WTRU specific period of the cell specific uplink frame, wherein the WTRU specific period is based on a duty cycle, and retuning to the first frequency and receiving an uplink grant in a subsequent sub-frame.

主权项

1. A method, implemented in a wireless transmit/receive unit (WTRU), for supporting a half-duplex (HD) frequency division duplex (FDD) (HD-FDD) operation mode in a network operating in a FDD operation mode, the method comprising:
transmitting an indication of the HD-FDD operation mode to a base station of the network; monitoring a first frequency for downlink transmissions; receiving, via the first frequency, a first downlink subframe including an uplink grant; determining, based on a timing of the uplink grant, a second downlink subframe that immediately precedes an uplink subframe allocated by the uplink grant; ceasing any of monitoring and reception on the first frequency during the second downlink subframe; retuning to a second frequency, wherein the returning to the second frequency takes place within a first time period starting from the cessation and ending prior to the uplink subframe; transmitting during the uplink subframe via the second frequency; subsequent to transmitting during the uplink subframe, retuning to the first frequency, wherein the retuning to the first frequency takes place within a second time period corresponding to a third downlink subframe that immediately follows cessation of uplink transmissions; and monitoring and/or receiving during a fourth downlink subframe following the third downlink subframe via the first frequency.