Radio network controller and a method therein for managing a random access channel
地域：
Stockholm
摘要
A Radio Network Controller, RNC, and a method performed by the RNC for managing the utilization of a RACH of a WCDMA communication network wherein the RNC is associated with an RBS, wherein the RACH is an uplink channel between UEs and the RBS are provided. The method comprises determining a current resource utilization level of the RACH; setting, based on the determined resource utilization, a value of at least one Radio Link Control, RLC, parameter that controls the disposition of a UE to transmit data on the RACH; and employing the at least one RLC parameter to at least one UE being in a Cell Forward Access Channel, CELL_FACH, state or entering into the CELL_FACH state.
說(shuō)明書
This application is a 371 of International Application No. PCT/EP2014/051586, filed Jan. 28, 2014, the disclosure of which is fully incorporated herein by reference.
The present disclosure relates to wireless communication networks and in particular to managing the utilisation of a Random Access Channel, RACH, of a Wideband Code Division Multiple Access, WCDMA, communication network
In wireless communication networks, users may move about geographically freely, at least within the coverage area of the wireless communication network. There are different types of so-called generations of communication networks, e.g. 2G, 3G and 4G. These different generations employ different techniques, e.g. 2G wireless communication networks are also called Global System for Mobile Communications, GSM, is based on Time Division Multiple Access, TDMA; 3G wireless communication networks are also called Universal Mobile Telecommunications System, UMTS, is based on Wideband Code Division Multiple Access, WCDMA; and 4g wireless communication networks are also called Long Term Evolution, LTE, is based on Orthogonal Frequency Division Multiplex, OFDM. These different wireless communication systems have both similarities and differences.
權(quán)利要求
The invention claimed is:1. A method performed by a Radio Network Controller, RNC, for managing the utilisation of a Random Access Channel, RACH, of a Wideband Code Division Multiple Access, WCDMA, communication network, the RNC being associated with a Radio Base Station, RBS, wherein the RACH is an uplink channel between User Equipments, UEs, and the RBS, the method comprising:determining a current resource utilisation level of the RACH; setting, based on the determined resource utilisation, a value of at least one Radio Link Control, RLC, parameter that controls the disposition of a UE in a Cell Forward Access Channel, CELL FACH, state to transmit or retransmit a data packet on the RACH while awaiting acknowledgement on a previously transmitted data packet on the RACH; and employing the at least one RLC parameter to at least one UE being in the Cell Forward Access Channel, CELL_FACH, state. 2. The method according to claim 1 , further comprising signalling the at least one RLC parameter to at least one UE being in the Cell Forward Access Channel, CELL_FACH, state. 3. The method according to claim 2 , wherein the RLC parameters are signalled to the at least one UE via inband RLC signalling using a Status Packet Data Unit, PDU. 4. The method according to claim 2 , further comprising setting at least one of RLC parameters Timer_Poll, and Timer_Status_Prohibit for the RNC; and Timer_Status_Prohibit for the at least one UE based on the determined resource utilisation level of the RACH. 5. The method according to claim 1 , wherein the RLC parameters are set per UE currently being connected to the RNC; and being in CELL_FACH state. 6. The method according to claim 1 , wherein the at least one RLC parameters is Timer_Poll or Tx_Window_Size or both the Timer_Poll and the Tx_Window_Size used by the at least one UE. 7. The method according to claim 6 , wherein when the resource utilisation level of the RACH goes above a threshold, the value of Timer_Poll is increased and the value of Tx_Window_Size is decreased; and when the resource utilisation level of the RACH falls below the threshold, the value of Timer_Poll is decreased and the value of Tx_Window_Size is increased. 8. The method according to claim 1 , wherein determining the resource utilisation level of the RACH comprises measuring a Round Trip Time, RTT, between the RNC and the at least one UE and/or an RTT between the RBS and the at least one UE. 9. A Radio Network Controller, RNC, adapted for managing the utilisation of a Random Access Channel, RACH, of a Wideband Code Division Multiple Access, WCDMA, communication network, the RNC being associated with a Radio Base Station, RBS, wherein the RACH is an uplink channel between User Equipments, UEs, and the RBS, the RNC comprising:a processor; and a memory, the memory comprising instructions which when executed by the processor causes the RNC to: determine a current resource utilisation level of the RACH; set based on the determined resource utilisation, a value of at least one Radio Link Control, RLC, parameter that controls the disposition of a UE in a Cell Forward Access Channel, CELL FACH, state to transmit or retransmit a data on the RACH while awaiting acknowledgement on a previously transmitted data packet on the RACH; and employ the at least one RLC parameter to at least one UE being in the Cell Forward Access Channel, CELL_FACH, state. 10. The RNC according to claim 9 , the memory further comprising instructions which when executed by the processor causes the RNC to signal the at least one RLC parameter to at least one UE being in the Cell Forward Access Channel, CELL_FACH, state. 11. The RNC according to claim 10 , wherein the memory further comprises instructions which when executed by the processor causes the RNC to signal the parameter to the at least one UE via inband RLC signalling using a Status Packet Data Unit, PDU. 12. The RNC according to claim 10 , wherein the memory further comprises instructions which when executed by the processor causes the RNC to set at least one of RLC parameters Timer_Poll, and Timer_Status_Prohibit for the RNC; and Timer_Status_Prohibit for the at least one UE based on the determined resource utilisation level of the RACH. 13. The RNC according to claim 9 , wherein the RLC parameters are set per UE currently being connected to the RNC; and being in CELL_FACH state. 14. The RNC according to claim 9 , wherein the at least one RLC parameters is Timer_Poll or Tx_Window_Size or both the Timer_Poll and the Tx_Window_Size used by the at least one UE. 15. The RNC according to claim 14 , wherein when the resource utilisation level of the RACH goes above a threshold, the value of Timer_Poll is increased and the value of Tx_Window_Size is decreased; and when the resource utilisation level of the RACH falls below the threshold, the value of Timer_Poll is decreased and the value of Tx_Window_Size is increased. 16. A Radio Network Controller, RNC, for managing the utilisation of a Random Access Channel, RACH, of a Wideband Code Division Multiple Access, WCDMA, communication network, the RNC being associated with a Radio Base Station, RBS, wherein the RACH is an uplink channel between User Equipments, UEs, and the RBS, the RBS comprising:a determining unit for determining a current resource utilisation level of the RACH, a setting unit for setting, based on the determined resource utilisation, a value of at least one Radio Link Control, RLC, parameter that controls the disposition of a UE in a Cell Forward Access Channel, CELL FACH, state to transmit or retransmit a data packet on the RACH while awaiting acknowledgement on a previously transmitted data packet on the RACH, and an employing unit for employing the at least one RLC parameter to at least one UE being in the Cell Forward Access Channel, CELL_FACH, state. 17. A computer readable medium containing computer readable code means, which when run in a processing unit comprised in an arrangement in a Radio Network Controller, RNC, causes the RNC to perform a method comprising:determining a current resource utilisation level of a Random Access Channel, RACH, of a Wideband Code Division Multiple Access, WCDMA, communication network, wherein the RACH is an uplink channel between User Equipments, UEs, and, a Radio Base Station, RBS, associated with the RNC; setting, based on the determined resource utilisation, a value of at least one Radio Link Control, RLC, parameter that controls the disposition of a UE in a Cell Forward Access Channel, CELL FACH, state to transmit or retransmit a data packet on the RACH while awaiting acknowledgement on a previously transmitted data packet on the RACH; and employing the at least one RLC parameter to at least one UE being in the Cell Forward Access Channel, CELL_FACH, state.
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