Methods and apparatus for registration and data transmission using fast/zero contention resolution
View Patent ↗Example methods and apparatus for registration and data transmission using fast/zero contention resolution are disclosed. An example method for transmission on a random-access channel (RACH) involves transmitting a mobile station radio access capabilities (MS RAC) message to a network and receiving an identification (ID) from the network subsequent to the MS RAC. The ID is locally unique and provides contention resolution. A timing advance is determined and further transmissions are performed on the RACH using the ID and the TA.
1. A method performed by a device for transmission on a random-access channel (RACH) comprising:
transmitting a mobile station radio access capabilities (MS RAC) message to a network;
receiving an identification (ID) assigned by the network subsequent to the MS RAC, the ID being locally unique and providing contention resolution;
determining a timing advance (TA);
performing further transmissions on the RACH using the ID and the TA; and
receiving an assignment of membership to a RACH group, wherein a member of the RACH group is assigned to transmit on a frame on the RACH, the frame dedicated to the RACH group.
2. The method of claim 1 wherein the transmitting is from the device to a base station (BS) serving a cell and the receiving is from the BS to the device.
3. The method of claim 1 wherein the method is performed for registration on the network and the method is repeated when:
the device is served by a different cell;
the device is reset;
the registration has failed; or
the timing advance has changed.
4. The method of claim 3 wherein the registration is for data services.
5. The method of claim 1 further comprising receiving an assignment to the RACH dedicated to the device for the further transmissions.
6. The method of claim 1 further comprising receiving a combination of the ID and the RACH group, the combination uniquely identifying the device within the cell and providing contention resolution.
7. The method of claim 6 , further comprising receiving a global identifier for the device, wherein the global identifier is determined from the combination.
8. The method of claim 7 wherein the global identifier comprises an international mobile subscriber identity (IMSI).
9. The method of claim 1 further comprising calculating group frame numbers as a function of the ID and as a function of a fixed repetition period.
10. The method of claim 1 wherein the RACH group has a maximum membership of 2^(n−1) where n is a number of bits in a random number reference in an access burst.
11. The method of claim 1 further comprising calculating group frame numbers as a function of the ID and as a function of a variable repetition period.
12. The method of claim 11 wherein the variable repetition period is a function of transmission frequency requirements of the members of the RACH group.
13. The method of claim 11 wherein the calculating group frame numbers applies a unique offset as a function of the RACH group.
14. A device comprising:
a transceiver coupled to a processor;
the processor configured to:
transmit a mobile station radio access capabilities (MS RAC) message to a network;
receive an identification (ID) assigned by the network subsequent to the MS RAC, the ID being locally unique and providing contention resolution;
determine a timing advance (TA); and
perform further transmissions on a random-access channel (RACH) using the ID and the TA without performing contention resolution.
15. A device as defined in claim 14 , wherein the ID being locally unique comprises the ID being locally unique in a cell of the network.
16. A device comprising:
a transceiver coupled to a processor;
the processor configured to:
transmit a mobile station radio access capabilities (MS RAC) message to a network;
receive an identification (ID) assigned by the network subsequent to the MS RAC, the ID being locally unique and providing contention resolution;
determine a timing advance (TA);
perform further transmissions on a random-access channel (RACH using the ID and the TA;
and determine group frame numbers associated with a RACH group as a function of the ID and as a function of a fixed repetition period.
17. A device as defined in claim 16 , wherein the ID being locally unique comprises the ID being locally unique in a cell of the network.
18. A device comprising:
a transceiver coupled to a processor;
the processor configured to:
transmit a mobile station radio access capabilities (MS RAC) message to a network;
receive an identification (ID) assigned by the network subsequent to the MS RAC, the ID being locally unique and providing contention resolution;
determine a timing advance (TA);
perform further transmissions on a random-access channel (RACH) using the ID and the TA;
and determine group frame numbers associated with a RACH group as a function of the ID and as a function of a variable repetition period that is a function of transmission frequency requirements of members of the RACH group.
19. A device as defined in claim 18 , wherein the ID being locally unique comprises the ID being locally unique in a cell of the network.
20. A device as defined in claim 14 , wherein the processor is further configured to receive an assignment of membership to a RACH group, wherein a member of the RACH group is assigned to transmit on a frame on the RACH, the frame dedicated to the RACH group.