A wireless communication method and apparatus for reporting traffic volume measurement (TVM) information used to support enhanced uplink (eu) data transmissions between a wireless transmit/receive unit (WTRU), i.e., a mobile station, and a Node-B. After storing eu data in a buffer, the WTRU sends an initial TVM information request message to the Node-B indicating that the WTRU has eu data available to send to the Node-B. In response, the Node-B schedules one or more allowed eu data transmissions. The WTRU transmits at least a portion of the stored eu data to the Node-B via the allowed eu data transmissions. In one embodiment, the initial TVM information request message is sent by the WTRU only after the quantity of eu data stored in the buffer of the WTRU exceeds an established threshold. Otherwise, all of the stored eu data is transferred to the Node-B without requiring scheduling by the Node-B.
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1. A method for use by a frequency division duplex wideband code division multiple access user equipment (UE) for enhanced uplink (eu) transmission, comprising:
when the UE is not scheduled for eu transmission:
allowing the UE to transmit eu data up to a predetermined threshold without being scheduled for eu transmission;
triggering transmission of a scheduling request message when a quantity of stored eu data exceeds the predetermined threshold, the scheduling request message being multiplexed with eu medium access control (MAC) data and the scheduling request message indicating a total amount of eu data in the buffer and an amount of data associated with a logical channel and priority information associated with the logical channel;
receiving information to schedule eu transmissions;
transmitting eu data in response to the received eu transmission scheduling information over an eu channel; and
when the UE is scheduled for eu transmission:
transmitting an updated scheduling request message multiplexed with eu MAC data over an eu channel when eu data is in the buffer for transmission.
4. A frequency division duplex wideband code division multiple access user equipment (UE) comprising:
a buffer configured to receive enhanced uplink (eu) data for transmission, the eu data associated with logical channels; wherein:
the UE configured when the UE is not scheduled for eu transmission to:
transmit eu data up to a predetermined threshold without being scheduled for eu transmission and trigger transmission of a scheduling request message when a quantity of stored eu data exceeds the predetermined threshold, the scheduling request message being multiplexed with eu medium access control (MAC) data and the scheduling request message indicating a total amount of eu data in the buffer and an amount of data associated with a logical channel and priority information associated with the logical channel;
receive information to schedule eu transmission and to transmit eu data in response to the received eu transmission scheduling information over an eu channel; and
transmit an updated scheduling request message multiplexed with eu MAC data over an eu channel when the UE is scheduled for transmission and eu data is in the buffer for transmission.
7. A frequency division duplex wideband code division multiple access user equipment (UE) comprising:
a buffer configured to receive enhanced uplink (eu) data for transmission, the eu data associated with logical channels;
a transmitting device configured when the UE is not scheduled for eu transmission to:
transmit eu data up to a predetermined threshold without being scheduled for eu transmission and trigger transmission of a scheduling request message when a quantity of stored eu data exceeds the predetermined threshold, the scheduling request message being multiplexed with eu medium access control (MAC) data and the scheduling request message indicating a total amount of eu data in the buffer and an amount of data associated with a logical channel and priority information associated with the logical channel;
a receiving device configured to receive information to schedule eu transmission and to transmit eu data in response to the received eu transmission scheduling information over an eu channel; and
the transmitting device configured to transmit an updated scheduling request message multiplexed with eu MAC data over an eu channel when the UE is scheduled for transmission and eu data is in the buffer for transmission.
2. The method of
5. The UE of
8. The UE of
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This application claims priority from U.S. Provisional Patent Application Ser. No. 60/557,974, filed Mar. 31, 2004, which is incorporated by reference as if fully set forth herein.
The present invention is related to a wireless communication system including a wireless transmit/receive unit (WTRU) and a Node-B. More particularly, the present invention is related to reporting enhanced uplink (EU) traffic volume measurement (TVM) information to support EU data transmissions between the WTRU and the Node-B over a signaling channel having a limited capacity.
Methods for enhancing uplink (UL) coverage, throughput and transmission latency in a wireless communication system, such as a frequency division duplex (FDD) system, are currently being investigated in release 6 (R6) of the third generation partnership project (3GPP). Instead of scheduling and assigning uplink physical channels in a radio network controller (RNC), a Node-B (i.e., base station) controller is used such that more efficient decisions can be made and uplink radio resources can be managed on a short-term basis better than the RNC, even if the RNC retains overall control of the system. A similar approach has already been adopted in the downlink for release 5 (R5) of high speed data packet access (HSDPA) in a universal mobile telecommunications system (UMTS) for both an FDD mode and a time division duplex (TDD) mode.
In order for the Node-B to make efficient allocation decisions and prioritize between different priority flows, the Node-B must keep track of TVMs along with the associated priority. However, conventional UL signaling methods have limited capacity, and thus may not be able to accommodate the reporting of TVMs along with their associated priorities.
The present invention is a wireless communication method and apparatus for reporting EU TVM information to support EU data transmissions between a WTRU, (i.e., a mobile station), and a Node-B. The apparatus may be a wireless communication system, a WTRU and/or an integrated circuit (IC). EU data is generated and stored in a buffer of the WTRU. The WTRU transmits an initial TVM information request message to the Node-B indicating that the WTRU has EU data to transfer to the Node-B. In response to receiving the initial TVM information request message, the Node-B schedules one or more allowed EU data transmissions between the WTRU and the Node-B by transmitting an EU data scheduling message to the WTRU.
The WTRU transfers all of the EU data stored in the buffer to the Node-B if the allowed EU data transmissions are sufficient to support transmission of all of the EU data stored in the buffer. Otherwise, the WTRU may transmit detailed TVM information multiplexed with at least a portion of the EU data to the Node-B.
The TVM information may indicate the quantity of the stored EU data. The detailed TVM information may indicate a quantity of buffered EU data associated with each of a plurality of traffic priority classes. The detailed TVM information may be multiplexed at a layer 2 medium access control (MAC) entity, or at a layer 3 radio resource control (RRC) or other equivalent layer 3 signaling entity.
The procedure used to transfer EU data stored in the buffer of the WTRU may be dependent upon whether or not the quantity of the EU data exceeds an established threshold. The initial TVM information request message may be transmitted to the Node-B only after the quantity of the stored EU data exceeds the established threshold. When the established threshold is not exceeded, the WTRU may transfer all of the EU data from the buffer of the WTRU to the Node-B without requiring scheduling information from the Node-B. If the established threshold is set to zero, the WTRU may transfer the stored EU data from the buffer of the WTRU to the Node-B only after receiving scheduling information from the Node-B.
A more detailed understanding of the invention may be had from the following description of a preferred example, given by way of example and to be understood in conjunction with the accompanying drawing wherein:
Hereafter, the terminology “WTRU” includes but is not limited to a user equipment (UE), mobile station, fixed or mobile subscriber unit, pager, or any other type of device capable of operating in a wireless environment.
When referred to hereafter, the terminology “Node-B” includes but is not limited to a base station, site controller, access point or any other type of interfacing device in a wireless environment.
The present invention may be further applicable to TDD, FDD, and time division synchronous code division multiple access (TD-SCDMA), as applied to UMTS, CDMA 2000 and CDMA in general, but is envisaged to be applicable to other wireless systems as well.
The features of the present invention may be incorporated into an IC or be configured in a circuit comprising a multitude of interconnecting components.
Referring still to
Node-B 110 can utilize the comprehensive knowledge of the TVM information and potentially associated priorities and/or logical channels reported via the EU data transmissions 220 in subsequent uplink scheduling. When the WTRU 105 obtains additional EU data later on, the WTRU 105 may choose to report updated TVM information to the Node-B 110. The Node-B 110 then schedules subsequent EU data transmissions from the WTRU 105 to the Node-B 110 via subsequent EU data scheduling messages 225a-225n.
EU data transmissions sent by the WTRU 105 are not required to be scheduled by the Node-B 110 when the established EU data buffer threshold is not exceeded.
Still referring to
Data associated with priority class or logical channels/MAC-d flows associated with TVMs may be stored in the Node-B 110 to make more precise channel allocations and more efficient use of radio resources. The Node-B 110 utilizes the TVMs and associated priorities to establish subsequent EU data scheduling with greater accuracy due to the additional TVM detail provided by the WTRU 105.
It should be noted that the established EU data buffer threshold may be set to zero. In this case, the storage of any amount of EU data in the buffer 120 of the WTRU 105 will always trigger the transmission of an initial TVM information request message 210.
Still referring to
If the EU data transmissions allowed by the current scheduling information are not sufficient to transmit all of the EU data buffered in the WTRU 105, the WTRU 105 transmits one or more EU data transmissions including detailed TVM information multiplexed with a portion of the stored EU data to the Node-B 110 (step 435). In step 440, the Node-B 110 schedules and transmits one or more additional EU data transmissions until there is no more EU data buffered in the WTRU 105.
While this invention has been particularly shown and described with reference to preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention described hereinabove.
Zhang, Guodong, Dick, Stephen G., Terry, Stephen E.
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