Uplink and downlink frame synchronization communication method of communication system including relay station
A communication system and communication method technology are applied in the field of uplink and downlink frame synchronization communication, and can solve the problems of few downlink backhaul resources, small RN cell range, and inability to take into account the backhaul coverage and interference well.
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example 1
[0042] Example 1: "Borrowing uplink subframe resource unit is OFDM symbol
[0043] Such as Figure 7 As shown, when the borrowed uplink subframe resource unit is an OFDM symbol, the R-UE normally sends data in the corresponding uplink subframe, but the RN only accepts the first n OFDM symbols, and the remaining m=14-n symbols are used for sending- Reception (Tx-Rx) transition and timing advance TA, the length of TA is equal to the transmission delay from eNB to RN, so that each base station can receive information from each relay station and user terminal synchronously.
example 2
[0044] Example 2: Borrowing accessUL resource units as time slots
[0045] Such as Figure 8 As shown, when the uplink subframe resource unit is used as a time slot, the R-UE is only scheduled to use the previous time slot of the uplink subframe, and the latter time slot is used for Tx-Rx conversion and timing advance TA, TA The length is equal to the transmission delay from eNB to RN.
[0046] The uplink frames are aligned by borrowing the uplink subframe resources above, and the alignment of the corresponding downlink frames can adopt the existing solutions as described in the background technology, for example, it can be completed by delay or reducing the GP length . However, the amount of delay will lead to the loss of complete synchronization between eNB and RN, causing interference problems; the reduction of GP length will lead to the reduction of RN coverage. Therefore, the present invention provides a communication method for synchronously sending downlink informati...
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