Early data transmission in a random access procedure
A method comprises communicating, between a terminal ( 102 ) and a base station ( 101 ), an uplink control message ( 6001, 6003 ) of a random access procedure, the uplink control message ( 6001, 6003 ) comprising an indicator indicative of uplink payload data ( 6005, 6007 ) queued for transmission during the random access procedure. The method also comprises configuring the random access procedure depending on the indicator and communicating, in the random access procedure configured in accordance with the indicator, the uplink payload data ( 6005, 6007 ).
1. A method, comprising:
communicating, between a terminal and a base station, an uplink control message of a random access procedure, the uplink control message comprising an indicator indicative of uplink payload data queued for transmission during the random access procedure,
configuring the random access procedure depending on the indicator, and
communicating, in the random access procedure configured in accordance with the indicator, the uplink payload data,
wherein said configuring comprises:
setting a count of repetitions of a Layer 3 connection request message of the random access procedure depending on the indicator.
2. The method of claim 1 ,
wherein the uplink control message is a random access message of the random access procedure which includes a random access preamble of the terminal.
3. The method of claim 2 ,
wherein the random access preamble implements the indicator.
4. The method of claim 3 ,
wherein a predefined subset of one or more random access preambles from a pool of predefined random access preambles is used to implement the indicator.
5. The method of claim 2 ,
wherein the random access message includes the random access preamble and the indicator as separate information fields.
6. The method of claim 1 ,
wherein the uplink control message is a Layer 3 connection request message of the random access procedure.
7. The method of claim 1 ,
wherein the indicator is indicative of a size of the uplink payload data.
8. The method of claim 1 , further comprising:
communicating multiple repetitions of a Layer 3 connection request message of the random access procedure in accordance with the indicator.
9. The method of claim 1 , further comprising:
communicating multiple repetitions of a Layer 3 connection response message of the random access procedure in accordance with the indicator.
10. The method of claim 8 ,
wherein the multiple repetitions of the Layer 3 connection request message and the multiple repetitions of the Layer 3 connection response message are communicated interleaved in time domain.
11. The method of claim 1 , further comprising:
communicating a first Layer 3 connection response message of the random access procedure, the first Layer 3 connection response message including a further indicator indicative of a count of at least one second Layer 3 connection response message of the random access procedure, and
communicating the at least one second Layer 3 connection response message in accordance with the further indicator.
12. The method of claim 1 ,
wherein said configuring comprises:
setting a delay of a Layer 3 connection response message of the random access procedure with respect to a Layer 3 connection request message of the random access procedure depending on the indicator.
13. The method of claim 12 ,
wherein the delay is not smaller than 200 ms.
14. The method of claim 12 ,
wherein the Layer 3 connection response message includes a round-trip time indicator indicative of a round-trip time of transmissions between the base station and a destination of the uplink payload data.
15. The method of claim 1 , further comprising:
communicating a Layer 3 connection response message of the random access procedure, the Layer 3 connection response message including downlink payload data from a destination to which the uplink payload data is directed.
16. The method of claim 1 ,
wherein the uplink payload data is included in a Layer 3 connection request message of the random access procedure.
17. The method of claim 16 , further comprising:
communicating a Layer 3 connection response message of the random access procedure, the Layer 3 connection response message including a positive or negative acknowledgement of reception of the uplink payload data.
18. A terminal device comprising control circuitry configured to perform:
transmitting, to a base station of a wireless network, an uplink control message of a random access procedure, the uplink control message comprising an indicator indicative of uplink payload data queued for transmission during the random access procedure,
configuring the random access procedure depending on the indicator, and
transmitting, in the random access procedure configured in accordance with the indicator, the uplink payload data,
wherein said configuring comprises:
setting a count of repetitions of a Layer 3 connection request message of the random access procedure depending on the indicator.
19. A base station comprising control circuitry configured to perform:
receiving, from a terminal device, an uplink control message of a random access procedure, the uplink control message comprising an indicator indicative of uplink payload data queued for transmission during the random access procedure,
configuring the random access procedure depending on the indicator, and
receiving, in the random access procedure configured in accordance with the indicator, the uplink payload data,
wherein said configuring comprises:
setting a count of repetitions of a Layer 3 connection request message of the random access procedure depending on the indicator.