초록 ▼

Systems and methods of pre-allocating identifiers to wireless devices for use in requesting resources over a random access channel are described. A wireless communication system includes a random access channel over which wireless devices can anonymously send requests for resources. The base station

Systems and methods of pre-allocating identifiers to wireless devices for use in requesting resources over a random access channel are described. A wireless communication system includes a random access channel over which wireless devices can anonymously send requests for resources. The base stations receiving and processing the anonymous requests reduces the probability of random access channel collisions and conserves the resources needed to support the anonymous requests by pre-allocating one or more identifiers to select wireless devices. The wireless devices having the pre-allocated codes can transmit a particular code over the random access channel as a request for resources that uniquely identifies the requester.

대표청구항 ▼

1. A method of operating a wireless cellular system, comprising: transmitting, from a serving base station, an indication of a first reserved set of access identifiers usable for non-contention access over a first random access channel by a mobile station in a coverage area of the serving base stati

1. A method of operating a wireless cellular system, comprising: transmitting, from a serving base station, an indication of a first reserved set of access identifiers usable for non-contention access over a first random access channel by a mobile station in a coverage area of the serving base station;transmitting, from a target base station, an indication of a second reserved set of access identifiers usable for non-contention access over a second random access channel by the mobile station in a coverage area of the target base station;enabling the mobile station to obtain, during a handover of the mobile station from the serving base station to the target base station, an indication of a non-contention reserved access identifier identifying the mobile station in the coverage area of the target base station, the non-contention reserved access identifier belonging to the second reserved set of access identifiers;receiving, at the target base station, from the mobile station, the non-contention reserved access identifier over the second random access channel;transmitting, to the mobile station, from the target base station, a feedback message comprising a timing adjustment; andreceiving, at the target base station, a transmission from the mobile station, the transmission characterized by at least one adjusted operating parameter based at least in part on the feedback message. 2. The method of claim 1, further comprising: adjusting, by the mobile station, at least one operating parameter of the transmission based at least in part on the timing adjustment; andtransmitting, by the mobile station to the target base station, the transmission based on the at least one adjusted operating parameter. 3. The method of claim 1, wherein the feedback message further comprises at least one of a power adjustment or a frequency offset adjustment. 4. The method of claim 1, wherein the first reserved set of access identifiers is different from the second reserved set of access identifiers. 5. The method of claim 1, further comprising: receiving, at the mobile station, from the serving base station, an indication of a first non-contention reserved access identifier from the first reserved set of access identifiers, the first non-contention reserved access identifier identifying the mobile station in the coverage area of the serving base station. 6. The method of claim 5, wherein the first non-contention reserved access identifier is used for a specific type of request different from handover. 7. The method of claim 5, wherein the non-contention reserved access identifier identifying the mobile station in the coverage area of the target base station is different from the first non-contention reserved access identifier identifying the mobile station in the coverage area of the serving base station. 8. The method of claim 2, further comprising: transmitting, from the mobile station, to the target base station, a bandwidth request message subsequent to adjusting the at least one operating parameter of the transmission. 9. The method of claim 2, wherein the adjusting the at least one operating parameter synchronizes the mobile station with the target base station. 10. The method of claim 1, wherein the non-contention reserved access identifier is a code division multiple access (CDMA) code. 11. A method of operating a wireless cellular system, comprising: transmitting, from a target base station, an indication of a reserved set of access identifiers from a plurality of access identifiers for non-contention access over a shared random access channel in a coverage area of the target base station;communicating, from the target base station, an indication of a non-contention reserved access identifier, the non-contention reserved access identifier belonging to the reserved set of access identifiers;transmitting, from the target base station to a mobile station, information about a shared random access channel available in the coverage area of the target base station;transmitting, from the mobile station to the target base station, the non-contention reserved access identifier over the shared random access channel for handover;receiving, at the mobile station from the target base station, a feedback message comprising a timing adjustment; andadjusting uplink transmission timing of the mobile station using the received timing adjustment. 12. The method of claim 11, wherein the feedback message further comprises a power adjustment or a frequency offset adjustment. 13. The method of claim 11, wherein the non-contention reserved access identifier is a code division multiple access (CDMA) code. 14. The method of claim 11, wherein the non-contention reserved access identifier identifies the mobile station in the coverage area of the target base station. 15. The method of claim 11, wherein the shared random access channel includes a number of OFDM subcarriers, symbols, or a combination of OFDM subcarriers and symbols. 16. A wireless cellular system comprising: a mobile station;a serving base station operable to transmit to the mobile station an indication of a first reserved set of access identifiers usable for non-contention access over a first random access channel by the mobile station in a coverage area of the serving base station; anda target base station operable to: transmit an indication of a second reserved set of access identifiers usable for non-contention access over a second random access channel by the mobile station in a coverage area of the target base station;transmit, during a handover of the mobile station from the serving base station to the target base station, an indication of a non-contention reserved access identifier identifying the mobile station in the coverage area of the target base station, the non-contention reserved access identifier belonging to the second reserved set of access identifiers;receive the non-contention reserved access identifier from the mobile station over the second random access channel; andtransmit to the mobile station a feedback message comprising a timing adjustment;the mobile station operable to adjust at least one operating parameter of a transmission to the target base station, based at least in part on the feedback message. 17. The wireless cellular system of claim 16, wherein the mobile station is further operable to transmit a bandwidth request message to the target base station subsequent to adjusting the at least one operating parameter of the transmission. 18. The wireless cellular system of claim 16, wherein the non-contention reserved access identifier is a code division multiple access (CDMA) code. 19. The wireless cellular system of claim 16, wherein the feedback message further comprises at least one of a power adjustment or a frequency offset adjustment. 20. The wireless cellular system of claim 16, wherein the first reserved set of access identifiers is different from the second reserved set of access identifiers. 21. The wireless cellular system of claim 16, wherein the mobile station is further operable to receive from the serving base station an indication of a first non-contention reserved access identifier from the first reserved set of access identifiers, the first non-contention reserved access identifier identifying the mobile station in the coverage area of the serving base station. 22. The wireless cellular system of claim 21, wherein the first non-contention reserved access identifier is used for a specific type of request different from handover. 23. The wireless cellular system of claim 21, wherein the non-contention reserved access identifier identifying the mobile station in the coverage area of the target base station is different from the first non-contention reserved access identifier identifying the mobile station in a coverage area of the serving base station. 24. The wireless cellular system of claim 16, wherein adjusting the at least one operating parameter of the transmission to the target base station synchronizes the mobile station with the target base station. 25. A wireless cellular system comprising: a mobile station; anda base station operable to: transmit to the mobile station an indication of a reserved set of access identifiers usable for non-contention access over a shared random access channel by the mobile station in a coverage area of the base station;communicate to the mobile station an indication of a non-contention reserved access identifier, the non-contention reserved access identifier belonging to the reserved set of access identifiers;transmit to the mobile station information about the shared random access channel;the mobile station operable to: transmit to the base station the non-contention reserved access identifier over the shared random access channel;receive from the base station a feedback message comprising a timing adjustment; andadjust uplink transmission timing of the mobile station using the received timing adjustment. 26. The wireless cellular system of claim 25, wherein the shared random access channel includes a number of OFDM subcarriers, symbols, or a combination of OFDM subcarriers and symbols. 27. The wireless cellular system of claim 25, wherein the feedback message further comprises a power adjustment or a frequency offset adjustment. 28. The wireless cellular system of claim 25, wherein the non-contention reserved access identifier is a code division multiple access (CDMA) code. 29. The wireless cellular system of claim 25, wherein the non-contention reserved access identifier identifies the mobile station in the coverage area of the base station.