Methods, terminal devices, network elements and apparatuses for random access process
Embodiments of the present disclosure relate to methods, terminal devices, network nodes and apparatus for random access process in a wireless network. The method at the terminal device may comprise: receiving additional information related to a terminal device together with a random access preamble. With embodiments of the present disclosure, the additional information related to a terminal device can be transmitted to the network node together with a random access preamble; in such a case, further useful information is available for the eNB, which might substantially facilitate the random access process for either initial access or non-initial access.
1. A method performed by a terminal device, the method comprising:
receiving, from a network device, a configuration information for performing a random access procedure,
wherein the configuration information comprises an indication related with a number of symbols for transmitting an uplink information; and
transmitting a random access preamble and the uplink information based on the configuration information,
wherein the random access preamble is transmitted in a physical random access channel and the uplink information is transmitted in a physical uplink channel, and
wherein the uplink information comprises a cell radio network temporary identifier (C-RNTI) and is transmitted after the random access preamble.
2. The method of claim 1 , wherein the uplink information comprises an identifier of the terminal device.
3. The method of claim 1 , wherein the uplink information further comprises one or more of:
a valid cell radio network temporary identifier;
a transmission beam power;
a preferred modulation and coding scheme;
a failure beam identifier;
a candidate beam identifier;
an uplink control channel resource indication; and
a downlink reference signal measurement value.
4. The method of claim 1 , wherein the uplink information is transmitted in a guard time or a subcarrier guard band.
5. The method of claim 1 , wherein the uplink information is transmitted in at least one of an uplink pilot time slot following the random access preamble or a guard period close to the uplink pilot time slot for transmitting the random access preamble.
6. The method of claim 1 , further comprising:
receiving a resource configuration indication to indicate the time and frequency resource for the transmitting of the preamble and the uplink information.
7. The method of claim 6 , wherein the resource configuration indication is transmitted by at least one of system information, a downlink control channel, or a terminal device specific higher layer signaling; and/or
wherein the resource configuration indication comprises one or more of:
a preamble time domain position indication;
a preamble frequency domain position indication;
a related beam group indication;
a preamble orthogonal cover code indication; or
an uplink transmission resource indication for the uplink information.
8. The method of claim 1 , further comprising:
identifying an uplink failure beam identifier from a transmission resource position of an uplink beam failure recovery request.
9. A method comprising:
transmitting, from a network device, a configuration information for performing a random access procedure,
wherein the configuration information comprises an indication related with a number of symbols for transmitting an uplink information; and
receiving a random access preamble and the uplink information based on the configuration information,
wherein the random access preamble is received in a physical random access channel and the uplink information is received in a physical uplink channel
wherein the uplink information comprises a cell radio network temporary identifier (C-RNTI) and is received after the random access preamble.
10. The method of claim 9 , wherein the uplink comprises an identifier of the terminal device.
11. The method of claim 9 , wherein the uplink information further comprises one or more of:
a valid cell radio network temporary identifier;
a transmission beam power;
a preferred modulation and coding scheme;
a failure beam identifier;
a candidate beam identifier;
an uplink control channel resource indication; and
a downlink reference signal measurement value.
12. The method of claim 9 , wherein the uplink information is received in a guard time or a subcarrier guard band.
13. The method of claim 9 , wherein the uplink information is received in at least one of an uplink pilot time slot following the random access preamble or a guard period close to the uplink pilot time slot for transmitting the random access preamble.
14. The method of claim 9 , further comprising:
transmitting a resource configuration indication to indicate the time and frequency resource for the transmitting of the preamble and the uplink information.
15. The method of claim 14 , wherein the resource configuration indication is received by at least one of system information, a downlink control channel, or a terminal device specific higher layer signaling; and/or
wherein the resource configuration indication comprises one or more of:
a preamble time domain position indication;
a preamble frequency domain position indication;
a related beam group indication;
a preamble orthogonal cover code indication; or
an uplink transmission resource indication for the uplink information.
16. The method of claims 9 to 15 , further comprising:
transmitting an uplink beam failure recovery request at a transmission resource position identifying an uplink failure beam identifier.
17. A terminal device, comprising:
a transceiver configured to transmit and/or receive signals; and
a controller, configured to process received signals and/or signals to be transmitted,
wherein the transceiver and/or the controller are configured to perform the method of claim 1 .