WO2008024321A2 - Dynamic resource allocation, scheduling and signaling for variable data rate service in lte - Google Patents
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- WO2008024321A2 WO2008024321A2 PCT/US2007/018440 US2007018440W WO2008024321A2 WO 2008024321 A2 WO2008024321 A2 WO 2008024321A2 US 2007018440 W US2007018440 W US 2007018440W WO 2008024321 A2 WO2008024321 A2 WO 2008024321A2
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Definitions
- the present invention is related to wireless communication systems. More particularly, the present invention is related to a method and apparatus for dynamic resource allocation, scheduling and signaling for variable data rate service in long term evolution (LTE) systems.
- LTE long term evolution
- UMTS Universal Mobile Telecommunications Systems
- 3G Third Generation
- 3GPP Third Generation Partnership Project
- the UMTS network architecture includes a Core Network (CN) interconnected with a UMTS Terrestrial Radio Access Network (UTRAN) via an Iu interface.
- the UTRAN is configured to provide wireless telecommunication services to users through wireless transmit receive units (WTRUs), referred to as user equipments (UEs) in the 3GPP standard, via a Uu radio interface.
- W-CDMA wireless transmit receive units
- the UTRAN has one or more radio network controllers (RNCs) and base stations, referred to as Node Bs by 3GPP, which collectively provide for the geographic coverage for wireless communications with UEs.
- RNCs radio network controllers
- Node Bs by 3GPP, which collectively provide for the geographic coverage for wireless communications with UEs.
- One or more Node Bs is connected to each RNC via an Iub interface.
- RNCs within a UTRAN communicate via an Iur interface.
- TrCHs Transport Channels
- TrCH data is conveyed by one or more physical channels defined by mutually exclusive physical radio resources, or shared physical radio resources in the case of shared channels
- HARQ automatic repeat request
- HARQ and ARQ employ a mechanism to send feedback to the original sender in the form of a positive acknowledgment (ACK) or a negative acknowledgement (NACK) that respectively indicate successful or unsuccessful receipt of a data packet to a transmitter so that the transmitter may retransmit a failed packet.
- HARQ also uses error correcting codes, such as turbo codes, for added reliability.
- Evolved universal terrestrial radio access (E-UTRA) and UTRAN long term evolution (LTE) are part of a current effort lead by 3GPP towards achieving high data-rate, low-latency, packet-optimized system capacity and coverage in UMTS systems.
- LTE is being designed with significant changes to existing 3GPP radio interface and radio network architecture, requiring evolved Node Bs (eNBs), which are base stations (Node Bs) configured for LTE.
- eNBs evolved Node Bs
- eNBs base stations
- LTE is being designed to use HARQ with one HARQ process assigned to each data flow and include physical layer support for multiple-input multiple-output (MIMO).
- MIMO multiple-input multiple-output
- LTE systems are also being designed to be entirely packet switched for both voice and data traffic. This leads to many challenges in the design of LTE systems to support voice over internet protocol (VoIP) service, which is not supported in current UMTS systems. VoIP applications provide continuous voice data traffic such that data rates vary over time due to intermittent voice activity. Variable data rate applications like VoIP provide specific challenges for physical resource allocation, as described below.
- eNBs in LTE are responsible for physical radio resource assignment for both uplink (UL) communications from a UE to the eNB, and downlink (DL) communications from eNB to a UE. Radio resource allocation in LTE systems involves the assignment of frequency-time (FT) resources in an UL or DL for a particular data flow.
- FT frequency-time
- FT resources are allocated according to blocks of frequency subcarriers or subchannels in one or more timeslots, generally referred to as radio blocks.
- the amount of physical resources assigned to a data flow is typically chosen to support the required data rate of the application or possibly other quality of service (QoS) requirements such as priority.
- QoS quality of service
- UL communications over the E-UTRA air interface in LTE can be made valid for either a predetermined duration of time, known as non-persistent assignment, or an undetermined duration of time, known as persistent assignment. Since the assignment messages transmitted by the eNB may target both the intended recipient UE of the assignment as well as any UEs currently assigned to the resources specified by the assignment, the eNB may multicast the assignment message, such that the control channel structure allows for UEs to decode control channel messages targeted for other UEs. [0013] For applications that require sporadic resources, such as hypertext transport protocol (HTTP) web browser traffic, the physical resources are best utilized if they are assigned on an as-need basis.
- HTTP hypertext transport protocol
- the resources are explicitly assigned and signaled by the layer 1 (Ll) control channel, where Ll includes the physical (PHY) layer.
- Ll includes the physical (PHY) layer.
- PHY physical
- persistent allocation radio resource assignments are valid as long as an explicit deallocation is not made.
- the objective of persistent scheduling is to reduce Ll and layer 2 (L2) control channel overhead, especially for VoIP traffic, where L2 includes the medium access control (MAC) layer.
- Persistent and non-persistent assignments by the Ll control channel may be supported using, for example, a persistent flag or a message ID to distinguish between the two types of assignment in an assignment message transmitted by the eNB.
- FIGs 2 and 3 illustrate examples of persistent allocation of frequency-time resources in LTE, where each physical layer sub-frame comprises four time interlaces to support ELARQ retransmissions of negatively acknowledged data.
- Each interlace is used for the transmission of a particular higher layer data flow, such that the same interlace in a subsequent sub-frame is used for retransmission of packets that were unsuccessfully transmitted.
- a fixed set of frequency-time (FT) resources are assigned in each interlace for control traffic as a control channel, which may include the Ll common control channel (CCCH) and synchronization channel.
- CCCH Ll common control channel
- Figure 2 shows an example of persistent allocation and deallocation.
- a first set of frequency-time resources (FTl), including one or more radio blocks, are allocated to UEi via the control channel.
- the eNB sends in sub-frame i a control message to UEi and UE2 in order to deallocate resources FTl from UEi and allocate them to UE2.
- the control channel can be used in the intermediate sub-frames between. sub- frames 1 and i for the assignment of other FT resources.
- FIG. 3 shows an example of persistent allocation and expansion, where eNB assigns additional physical resources FT2 to UEi in sub-frame i to support higher data rates for
- RTS real time services
- voice services a conversation is characterized by periods of speech followed by periods of silence, thus requiring alternating constantly varying data rates.
- AMR adaptive multi-rate
- AMR- WB adaptive multi-rate wide-band
- Current techniques for persistent resource scheduling are not designed to accommodate variations in data rates.
- an eNB In order to support variable data rates, an eNB must be signaled the changing data rates for both UL and DL traffic. In LTE systems, an eNB can easily monitor DL data rate variations that originate at the eNB and make efficient DL resource assignment.
- a method and apparatus for radio resource allocation, scheduling and signaling for variable data rate and real time service (RTS) applications are provided, where the present invention is preferably used in long term evolution (LTE) and high speed packet access (HSPA) systems.
- high-level information including radio access bearer (RAB), logical channel or data flow ID and HARQ process ID are only transmitted during a configuration stage of an RTS data flow. Sequence numbers for the RTS data flow are assigned at the radio link control (RLC) layer so that reordering of packets at a receiver are handled at higher layers.
- RAB radio access bearer
- RLC radio link control
- variable data rates for uplink (UL) RTS traffic are reported to an evolved Node B (eNB) by reporting only the change in data rate relative to a current data rate for an RTS service using layer 1, layer 2 or layer 3 signaling.
- eNB evolved Node B
- an eNB dynamically allocates radio blocks for RTS data flows in a wireless link in response to the uplink signaling of a change in data rate, such that if the data rate is decreased then a subset of the currently assigned radio blocks are deallocated or reallocated to other services or UEs, and if the data rate is increased, additional radio blocks are assigned to the RTS data flow.
- the eNB signals the new physical resource allocation to the UE by only signaling the change in radio block assignment.
- both the eNB and the UE store a table mapping radio resource requirements for different RTS data rates and channel conditions, such that the UE uses the table for dynamic resource assignment when a change in data rate is signaled for an RTS data flow.
- Figure 1 is a block diagram of the system architecture of a conventional UMTS network.
- Figure 2 is a diagram showing an example of persistent assignment allocation and deallocation in the time-frequency domain.
- Figure 3 is a diagram showing an example of persistent assignment allocation and expansion in the time-frequency domain.
- FIG. 4 is a flow diagram of a method for high-level configuration of real time services (RTS), in accordance with a first embodiment of the present invention.
- Figure 5 is a flow diagram of a method for signaling variable data rates for uplink traffic, in accordance with a second embodiment of the present invention.
- FIG. 6 is a flow diagram of a method for dynamic allocation and signalling of radio resources at an evolved Node B (eNB) for RTS with variable data rates, in accordance with a third embodiment of the present invention.
- eNB evolved Node B
- FIG. 7 is a flow diagram of a method for dynamic allocation and signalling of radio resources at a user equipment (UE) for RTS with variable data rates, in accordance with a fourth embodiment of the present invention.
- UE user equipment
- a wireless transmit/receive unit 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.
- a base station includes but is not limited to a Node-B, evolved Node B (eNB), site controller, access point or any other type of interfacing device in a wireless environment.
- eNB evolved Node B
- a base station is a type of WTRU.
- 3GPP Generation Partnership Project
- LTE long term evolution
- the present invention is applicable to wireless communication systems including, but not limited to, high speed packet access (HSPA) and HSPA evolution (HSPA+) systems.
- RTS real time services
- VoIP voice over internet protocol
- RAS radio access bearer
- logical channel may be used interchangeably with data flow.
- high-level information for a RTS data flow including a data flow identification (ID), or equivalently a radio access bearer (RAB) or logical channel ID, and a hybrid automatic repeat request (HARQ) process ID, are transmitted from an eNB to higher layers of a recipient UE during a configuration stage prior to the transmission of the data flow.
- ID data flow identification
- RAB radio access bearer
- HARQ hybrid automatic repeat request
- a HARQ process is preferably assigned for an entire data flow. Accordingly, the data flow ID and HARQ process ID are preferably only transmitted once at the beginning of the data flow and not on a per packet basis.
- a data flow ID and HARQ process ID for a user equipment UEi is sent in sub-frame 1 in connection with the assignment of frequency-time (FT) resources FTl to UEi.
- FT frequency-time
- a data flow ID and HARQ process ID for another user equipment UE2 is sent in sub- frame i in connection with the assignment of frequency-time (FT) resources FTl to UE 2 following the completion of the use of FTl by UEi.
- FIG. 4 is a flow diagram of a method 400 for high-level configuration of RTS in accordance with the first embodiment of the present invention.
- an eNB sends a data flow ID (or equivalently a RAB or logical channel ID) and a HARQ process ID as part of a configuration message for an RTS data flow before the transmission of data flow packets, for example in connection with FTl assignment to UEi in subframe 1 of Figure 2.
- the eNB does not include data flow ID and process ID fields in data flow packets for higher layers, but packet sequence numbers are included in an RLC control header, for example, for packets transmitted in subframes 2 though i-1 for the UEi communication of Figure 2 which ends.
- a transmitter is configured to transmit data flow and HARQ process IDs in a configuration message and transmit packet sequence numbers in an RLC control header.
- a UE preferably signals information to an eNB concerning variable data rates in uplink (UL) communications.
- An RTS data flow is initially assigned a certain amount of physical resources in order to support a current data rate using, for example, persistent assignment.
- the UE detects a new data rate, the UE preferably signals to the eNB the difference between the current data rate and the new data rate. By signaling only the difference in data rate, the number of overhead bits used is minimized.
- 4 reporting bits are required to report the actual data rate when up to 9 codec rates as used in a VoIP service. More reporting bits are used if more codec rates are available.
- the change in data rate of an RTS data flow over the UL may be signaled using layer 1 (Ll), layer 2 (L2) or layer 3 (L3) signaling, where Ll includes the physical (PHY) layer, layer 2 includes the medium access control (MAC) and radio link control (RLC) layers and layer 3 includes the radio resource control (RRC) layer.
- Ll includes the physical (PHY) layer
- L 2 includes the medium access control (MAC) and radio link control (RLC) layers
- layer 3 includes the radio resource control (RRC) layer.
- the change in data rate may be signaled at higher layers.
- Ll signaling of changes in data rate of XJL traffic is preferably done using Ll control signaling, such that variable data rate reporting bits may be multiplexed with other UL Ll signals including hybrid automatic repeat request (HARQ), acknowledgment (ACK), negative acknowledgment (NAK) and channel quality indicator (CQI).
- HARQ hybrid automatic repeat request
- ACK acknowledgment
- NAK negative acknowledgment
- CQI channel quality indicator
- an UL thin channel may be used.
- the UL thin channel is preferably used by a UE that needs to report a rate change to the eNB in an expedited manner so that the eNB assigns new UL resources to the RTS sooner.
- a data rate change indication can be sent using a synchronous random access channel (RACH), where the RACH has the benefit of small access delays.
- RACH synchronous random access channel
- the signaling of changes in data rate of UL traffic at L2 is preferably done by including rate change reporting bits in a MAC header of a packet scheduled for transmission over the UL.
- a rate change indication can be piggybacked with any UL L2 packet if the timing of the piggybacked packet is within a reasonable delay.
- a rate change indication can be sent via MAC control packet data unit (PDU), where the MAC control PDU may exclusively contain the data rate change indication or may contain other information for other control purposes.
- a rate change indication may be included in a periodic RLC status report from the UE to the eNB.
- L3 signaling a change in data rate may be signaled by including a rate change indication in RRC signaling.
- the eNB When the eNB detects the data rate change reported by a UE, the eNB dynamically reallocates physical resources assigned to the RTS of that UE accordingly. For example, if the data rate decreased, then the eNB can reallocate some of the resources originally assigned to the UE during persistent assignment to other UEs. The eNB may assign additional resources to the UE in the case of an increase in data rate.
- the dynamic allocation by the eNB overrides the initial resource allocation by persistent assignment.
- the eNB may specify a time duration during which the dynamic allocation overrides the original allocation when signaling the dynamic resource allocation to the UE. If no duration is specified, then it may be assumed that the dynamic allocation is only used once.
- the dynamic allocation by eNB to override persistent resource allocation is not only applicable to variable data rate services, but may also be used to reallocate resources for retransmissions.
- FIG. 5 is a flow diagram of a method 500 for signaling variable data rates for UL RTS traffic, in accordance with the second embodiment of the present invention.
- a UE signals variable data rates for UL RTS traffic to an eNB by reporting the change in data rate relative to a current data rate using a minimum number of bits, in step 505. The reporting may be done using Ll, L2 or L3 signaling, as described above.
- the eNB adjusts the amount of physical resources assigned to the UE for the RTS according to the reported change in data rate.
- a transceiver component may be configured to transmit signals reflecting change in data rate, and a resource allocation component may be configured to allocate physical resources.
- UL radio resources assigned to an RTS data flow are dynamically allocated in order to efficiently use the physical resources assigned to variable data rates services.
- the maximum amount of radio resources required for an RTS are initially assigned by persistent allocation, in order to support the maximum, data rate for the RTS.
- a set of N radio blocks are initially allocated by persistent scheduling.
- the eNB preferably dynamically allocates only a subset of the N radio blocks to the RTS data low when lower data rates are required. Under higher data rates, the eNB allocates a larger set of radio blocks, and can allocate new radio blocks in addition to the original set of N radio blocks, if desired. If sub-band allocation is supported, where radio resources are allocated according to fractions of a radio block, then dynamic resource allocation is preferably adapted to the granularity of sub-bands.
- the radio resource blocks assigned to the RTS are indexed, such that the radio blocks may be arranged in increasing or decreasing order according to index number. Accordingly, the eNB only signals the number of radio blocks for dynamic allocation, such that the UE accordingly uses the reported number of radio blocks in order of index number starting with the radio block with either lowest or the highest index number.
- the eNB reports that only 3 radio blocks are dynamically allocated to the UE. Based on the report from the eNB and starting with the lowest index, the UE knows that the new resource allocation is radio blocks 2, 3 and 5. Alternatively, a positive or negative difference between the original allocation of N blocks and the number needed may be signaled. Where more blocks are required, default parameters can be provided or block identification can be signaled for the additional blocks.
- a new radio resource allocation is preferably signaled by a eNB to a UE as a field in Ll or L2 control signaling for fast DL or UL dynamic resource allocation, or, in L3 RRC signaling in the case of slowly changing resource allocation.
- Ll or L2 control signaling When Ll or L2 control signaling is used, a physical layer ACK or NAK is preferably transmitted back to the eNB to improve the reliability of the resource allocation signaling.
- information including, but not limited to, the duration of new radio resource allocation, repetition period, sequence pattern, radio resource and the frequency hopping pattern may be provided as part of the radio resource allocation signaling, when desired.
- FIG. 6 is a flow diagram of a method 600 for dynamic allocation and signaling of radio resources at an eNB for RTS with variable data rates, in accordance with the third embodiment of the present invention.
- an eNB is notified of a change in data rate for an RTS data flow over a wireless link between the eNB and a UE such that N radio blocks are currently assigned to the RTS.
- the eNB dynamically allocates radio blocks to the UE for the RTS data flow in response to the change in data rate such that if the data rate decreased, then a subset of the N radio blocks are assigned, and if the data rate increased, then additional radio blocks are assigned.
- the eNB signals to the UE the new radio block allocation by only signaling the change in radio block assignment.
- the FT resource allocation for UEi made in sub-frame 1 does not necessarily remain fixed until sub-frame i, but can be dynamically changed per step 615 prior to sub-frame i.
- a data rate detection component may be configured to detect changes in data rate associated with a data flow
- a resource allocation component can be configured to allocate physical resources and is associated with a transmitter in order to signal resource allocations to a UE.
- a table relating data rates to radio resource characteristics is used for efficient radio resource allocation and signaling of UL resources.
- Both the eNB and the UE preferably store a pre-calculated table relating a number of radio resource blocks, or when applicable sub-bands, required for RTS data rates for a range of channel conditions according to, for example, modulation and coding scheme (MCS).
- MCS modulation and coding scheme
- the UE When a new data rate is identified at the UE for a current RTS data flow over the UL, the UE preferably calculates the needed radio resources under determined UL channel conditions based on the table entry for that data rate. Accordingly, the UE does not have to communicate with the eNB to adapt its resource assignment, and overhead control signaling to the eNB is reduced.
- the eNB signals a pre-allocated table to the UE where the table identifies specific radio resources, such as radio blocks or sub-bands, that are required for various RTS data rates for a range of channel conditions.
- radio blocks may be referred to by index number, as described above.
- the UE dynamically allocates UL resources in response to a change in data rate of an RTS data flow by looking up the corresponding resources in the table, and signals the assigned resource set to the eNB.
- the UE may wait for an approval message from the eNB before using the newly assigned UL resources.
- the eNB preferably sends an approval of new radio resource assignment when additional resources are allocated to accommodate an increase in data rate.
- the approval message from the eNB is optional when radio resources are deallocated for decreases in data rate.
- FIG. 7 is a flow diagram of a method 700 for dynamic allocation and signaling of radio resources at a user equipment (UE) for RTS with variable data rates, in accordance with the fourth embodiment of the present invention.
- a UE receives a table from an eNB that maps required radio resources or resource characteristics to RTS data rates under predetermined channel conditions.
- the UE detects a change in data rate of an UL RTS data flow, and determines the corresponding radio resource allocation from the table.
- the UE signals the determined radio resource allocation to the eNB and waits for an approval signal from the eNB before using the determined radio resources.
- a transceiver is used to receive the table from the eNB and signal radio resource allocations to the eNB, and a data rate detection component is configured to detect changes in data rate.
- Embodiment 1 A base station configured to conduct wireless communications in a wireless communication system.
- Embodiment 2 The base station of embodiment 1 comprising a resource allocation component configured to allocate for a selected period a set of physical resources of a wireless link to a variable data rate data flow with a wireless transmit/receive unit (WTRU) according to a current data rate associated with the data flow.
- WTRU wireless transmit/receive unit
- Embodiment 3 The base station of embodiment 2 further comprising a data rate detection component configured to detect a new data rate associated with the data flow.
- Embodiment 4 The base station as in any of embodiments 2-3 wherein said resource allocation component is configured to dynamically allocate a new set of physical resources to the data flow according to the new data rate during said selected period.
- Embodiment 5 The The base station as in any of embodiments.
- the data rate detection component is configured in a receiver to detect a new data rate based on signaling received from the WTRU during the selected period.
- Embodiment 6 The base station of embodiment 5 wherein the resource allocation component is associated with a transmitter that is configured to signal resource allocations to WTRUs.
- Embodiment 7 The base station of embodiment 6 wherein the transmitter is configured to signal resources allocations using one of layer 1, layer 2 or layer 3 signaling.
- Embodiment 8 The base station as in any of embodiments 6-7 wherein the transmitter is further configured to signal at least one of a duration, a repetition period, a sequence pattern, a radio resource pattern and a frequency hopping pattern associated with resource allocations to WTRUs.
- Embodiment 9 The base station as in any of embodiments 3-8 wherein the data rate detection component is configured to detect a new data rate based on receiving a signal indicative of the amount of change in the data rate from the WTRU.
- Embodiment 10 The base station as in any of embodiments 3-9 wherein the data rate detection component is configured to detect a new data rate based on receiving a signal indicative of an increase or decrease in required resource allocation from the WTRU.
- Embodiment 11 The base station of embodiment 10 wherein the resource allocation component is configured to signal a new set of allocated physical resources to the WTRU after receiving a signal indicative of an increase in required resource allocation from the WTRU.
- Embodiment 12 The base station as in any of embodiments 10-11 wherein the resource allocation component is configured not to signal a new set of allocated physical resources to the WTRU after receiving a signal indicative of a decrease in required resource allocation from the WTRU.
- Embodiment 13 The base station as in any of embodiments 2-12 wherein the resource allocation component is configured to signal a table that maps resources when signaling a set of allocated physical resources.
- Embodiment 14 The base station as in any of embodiments 10-13 wherein the resource allocation component is configured to signal approval of a new set of allocated physical resources to the WTRU after receiving a signal indicative of an increase in required resource allocation from the WTRU whereby the WTRU then uses the new set of allocated physical resources determined by the WTRU.
- Embodiment 15 The base station as in any of embodiments 3-14 wherein the data rate detection component is configured to detect a new data rate based on monitoring the data flow during the selected period and the resource allocation component is associated with a transmitter that is configured to signal resource allocations to WTRUs.
- Embodiment 16 The base station as in any of embodiments 2-15 wherein the resource allocation component is configured to signal resource allocations to WTRUs in terms of a number of blocks.
- Embodiment 17 The base station of embodiment 16 where the resource allocation component is configured to signal a revised set of allocated physical resources by signaling information related to the number of blocks in the revised set of allocated physical resources.
- Embodiment 18 The base station as in any of embodiments 2-17 wherein the physical resources include frequency-time resources.
- Embodiment 19 The base station as in any of embodiments 2-18 wherein the physical resources include radio blocks comprising blocks of frequency subcarriers and timeslots.
- Embodiment 20 The base station as in any of the preceding embodiments wherein the data flow is part of a real time service.
- Embodiment 21 The base station of embodiment 20 wherein the real time service is a Voice over Internet Protocol (VoIP) service.
- VoIP Voice over Internet Protocol
- Embodiment 22 The base station as in any of the preceding embodiments configured as an evolved Node B (eNB) in a 3GPP long term evolution (LTE) wireless communication system.
- eNB evolved Node B
- LTE long term evolution
- Embodiment 23 The base station of embodiment 22 wherein the
- WTRU is configured as a User Equipment (UE).
- UE User Equipment
- Embodiment 24 A base station configured with a hierarchy of layers including a lowest physical layer, a medium access control (MAC) layer and higher layers to conduct wireless communications in a wireless communication system.
- MAC medium access control
- Embodiment 25 The base station of embodiment 24 comprising a resource allocation component configured to allocate for a selected period a set of physical resources of a wireless link to a data flow with a wireless transmit/receive unit (WTRU) according to a current data rate associated with the data flow.
- WTRU wireless transmit/receive unit
- Embodiment 26 The base station of embodiment 25 further comprising a transmitter configured to signal resource allocations to WTRUs in a selected time frame format.
- Embodiment 27 The base station of embodiment 26 wherein the transmitter is configured to signal resource allocations to WTRUs in a selected time frame format such that a resource allocation for a data flow is transmitted in connection with a data flow identification (ID) in a higher layer in advance of transmitting data packets associated with the data flow.
- ID data flow identification
- Embodiment 28 The base station of embodiment 27 wherein the transmitter is further configured to transmit data packets associated with the data flow with packet sequence numbers in higher layers without the data flow
- Embodiment 29 The base station of embodiment 26 wherein the transmitter is configured to signal resource allocations to WTRUs in a selected time frame format such that a resource allocation for a data flow is transmitted in connection with a data flow identification (ID) and a hybrid automatic repeat request (HARQ) process ID in a higher layer in advance of transmitting data packets associated with the data flow.
- ID data flow identification
- HARQ hybrid automatic repeat request
- Embodiment 30 The base station of embodiment 29 wherein the transmitter is further configured to transmit data packets associated with the data flow with packet sequence numbers in higher layers without the data flow
- Embodiment 31 The base station as in any of embodiments 26-30 wherein the transmitter is configured to transmit data packets associated with data flows such that packet sequence numbers are excluded from physical layer and MAC layer signaling.
- Embodiment 32 The base station as in any of embodiments 25-31 configured as an evolved Node B (eNB) in a 3GPP long term evolution (LTE) wireless communication system wherein the WTRU is configured as a User
- eNB evolved Node B
- LTE long term evolution
- UE Radio Equipment
- Embodiment 33 A wireless transmit/receive unit (WTRU) configured to conduct wireless communications in a wireless communication system.
- WTRU wireless transmit/receive unit
- Embodiment 34 The WTRU of embodiment 33 comprising a transceiver component configured to utilize selectively allocated sets of physical resources of a wireless link for a variable data rate data flow with a base station.
- Embodiment 35 The WTRU of embodiment 24 wherein said transceiver component configured to accept a new dynamically allocated set of physical resources reflective of a rate change in the data flow while an allocated set of physical resources is being used.
- Embodiment 36 The WTRU as in any of embodiments 34-35 further comprising a data rate detection component configured to detect a new data rate associated with the data flow while an allocated set of physical resources is being used.
- a data rate detection component configured to detect a new data rate associated with the data flow while an allocated set of physical resources is being used.
- Embodiment 37 The WTRU of embodiment 36 wherein said transceiver component is configured to transmit a signal indicative of a detected rate change in the data flow to the base station.
- Embodiment 38 The WTRU of embodiment 37 wherein said transceiver component is configured to transmit a signal reflecting an amount of a detected rate change to the base station as the signal indicative of a detected rate change in the data flow.
- Embodiment 39 The WTRU of embodiment 38 wherein said transceiver component is further configured to use a new dynamically allocated set of physical resources signaled from the base station that is generated in response to the WTRU's signal reflecting an amount of a detected rate change.
- Embodiment 40 The WTRU as in any of embodiments 36-39 wherein the data rate detection component is configured to determine a new allocated set of physical resources in response to detecting a new data rate associated with the data flow.
- Embodiment 41 The WTRU of embodiment 40 wherein said transceiver component is configured to transmit a signal indicative of the determined new allocated set of physical resources to the base station as the signal indicative of a detected rate change in the data flow.
- Embodiment 42 The WTRU as in any of embodiments 35-41 wherein said transceiver component is configured to transmit a signal to the base station indicating an increase or a decrease of physical resources between the determined new allocated set of physical resources and the allocated set of physical resources being used as the signal indicative of a detected rate change in the data flow.
- Embodiment 43 The WTRU of embodiment 42 wherein said transceiver component is configured to use the determined new allocated set of physical resources upon determining a decrease in physical resources.
- Embodiment 44 The WTRU as in any of embodiments 42-43 wherein said transceiver component is further configured to use the determined new allocated set of physical resources after receiving a signal indicating acceptance by the base station when an increase in physical resources is determined.
- Embodiment 45 The WTRU as in any of embodiments 34-44 wherein said transceiver component is configured to receive from the base station signaling reflecting the selectively allocated sets of physical resources for the wireless link for the variable data rate data flow in terms of a number of resource blocks.
- Embodiment 46 The WTRU and is configured to receive a signal reflective of a revised number resource blocks upon which to base the new dynamically allocated set of physical resources reflective of a rate change in the data flow.
- Embodiment 47 The WTRU as in any of embodiments 33-46 configured as a UE in a long term evolution (LTE) wireless communication system.
- LTE long term evolution
- Embodiment 48 The WTRU as in any of embodiments 24-46 wherein the base station is configured as an evolved Node B (eNB).
- eNB evolved Node B
- Embodiment 49 A wireless transmit/receive unit (WTRU) configured with a heirarchy of layers including a lowest physical layer, a medium access control (MAC) layer and higher layers to conduct wireless communications in a wireless communication system.
- WTRU wireless transmit/receive unit
- MAC medium access control
- Embodiment 50 The WTRU of embodiment 49 comprising a transceiver component configured to utilize selectively allocated sets of physical resources of for a wireless link for a variable data rate data flow with a base station.
- Embodiment 51 The WTRU of embodiment 50 wherein said transceiver component configured to receive signals indicative of a resource allocation from a base station in a selected time frame format such that a resource allocation for a data flow is received in connection with a data flow identification (ID) in a higher layer in advance of receiving data packets associated with the data flow.
- ID data flow identification
- Embodiment 52 The WTRU of embodiment 51 wherein said transceiver component is further configured to receive data packets associated with the data flow with packet sequence numbers in higher layers without the data flow ID.
- Embodiment 53 The WTRU as in any of embodiment 50-52 wherein said transceiver component is configured to receive signals indicative of a resource allocation in a selected time frame format such that a resource allocation for a data flow is received in connection with a data flow identification (ID) and a hybrid automatic repeat request (HARQ) process ID in a higher layer in advance of receiving data packets associated with the data flow.
- ID data flow identification
- HARQ hybrid automatic repeat request
- Embodiment 54 The WTRU of embodiment 52 wherein said transceiver component is configured to then receive data packets associated with the data flow with packet sequence numbers in higher layers without the data flow ID or the HARQ process ID.
- Embodiment 55 The WTRU of embodiment 54 wherein said transceiver component is configured to receive data packets associated with data flows such that packet sequence numbers are excluded from physical layer and MAC layer signaling.
- Embodiment 56 The WTRU as in any of embodiments 50-55 configured as a UE in a long term evolution (LTE) wireless communication system wherein the base station is configured as an evolved Node B (eNB).
- LTE long term evolution
- eNB evolved Node B
- Embodiment 57 A method for dynamic resource allocation and signaling in a wireless communication system.
- Embodiment 58 The method of embodiment 57 comprising allocating a first set of physical resources of a wireless link to a variable data rate data flow according to a current data rate associated with the data flow.
- Embodiment 59 The method of embodiment 58 further comprising detecting a new data rate associated with the data flow.
- Embodiment 60 The method of embodiment 59 further comprising dynamically allocating a new set of physical resources to the data flow according to the new data rate.
- Embodiment 61 The method of embodiment 60 farther comprising signaling the new set of physical resources.
- Embodiment 62 The method as in any of embodiments 58-61 wherein the wireless link is between a WTRU and at least one other WTRU.
- Embodiment 63 The method of embodiment 62 wherein the signaling the new set of physical resources is to the at least one other WTRU.
- Embodiment 64 The method as in any of embodiments 61-63 wherein the signaling the new set of physical resources is in layer 1 or layer 2 signaling.
- Embodiment 65 The method as in any of embodiments 61-63 wherein the signaling the new set of physical resources is in layer 3 radio resource control signaling.
- Embodiment 66 The method as in any of embodiments 60-65 further comprising signaling at least one of a duration, a repetition period, a sequence pattern, a radio resource pattern and a frequency hopping pattern associated with the new set of physical resources.
- Embodiment 67 The method as in any of embodiments 61-66 further comprising receiving one of an acknowledgement (ACK) or a negative acknowledgement (NAK) in response to the signaling of the new set of physical resources.
- ACK acknowledgement
- NAK negative acknowledgement
- Embodiment 68 The method as in any of embodiments 61-67 wherein the signaling the new set of physical resources is by signaling a change from the first set of physical resources to the new set of physical resources.
- Embodiment 69 The method of embodiment 68 wherein the physical resources include radio blocks and the dynamically allocating the new set of physical resources is by adding or removing radio blocks from the first set of physical resources.
- Embodiment 70 The method of embodiment 69 wherein the removing blocks occurs when the new data rate is less than the current data rate.
- Embodiment 71 The method as in any of embodiments 69-70 wherein the adding blocks occurs when the new data rate is greater than the current data rate.
- Embodiment 72 The method as in any of embodiments 69-71 wherein each radio block has an associated index number and wherein the signaling the new set of physical resources is based on the index numbers.
- Embodiment 73 The method of embodiment 72 wherein the dynamically allocating the new set of physical resources is relative to a lowest index number associated with radio blocks in the first set of physical resources.
- Embodiment 74 The method as in any of embodiments 69-73 wherein the signaling the new set of physical resources includes a number of radio blocks in the new set of physical resources.
- Embodiment 75 The method as in any of embodiments 58-74 wherein the allocating the first set of physical resources is according to persistent assignment.
- Embodiment 76 The method as in any of embodiments 59-75 further comprising receiving the new data rate from an at least one other
- Embodiment 77 The method as in any of embodiments 67-76 wherein the new data rate is received as a relative change in data rate between the new data rate and the current data rate.
- Embodiment 78 The method as in any of embodiments 58-77 wherein the physical resources include frequency-time resources.
- Embodiment 79 The method of embodiment 78 wherein the physical resources include radio blocks comprising blocks of frequency subcarriers and timeslots.
- Embodiment 80 The method as in any of embodiments 58-79 wherein the data flow is part of a real time service.
- Embodiment 81 The method of embodiment 80 wherein the real time service is a Voice over Internet Protocol (VoIP) service.
- VoIP Voice over Internet Protocol
- Embodiment 82 The method as in any of embodiments 58-81 further comprising signaling a data flow ID and a hybrid automatic repeat request (HARQ) ID during a configuration stage for the data flow.
- HARQ hybrid automatic repeat request
- Embodiment 83 The method of embodiment 82 wherein the configuration stage is a control channel in a first sub-frame.
- Embodiment 84 The method of embodiment 83 further comprising assigning sequence numbers to packets of a data flow at a radio link control (RLC) layer.
- RLC radio link control
- Embodiment 85 A method for dynamic resource allocation and signaling in a wireless communication system.
- Embodiment 86 The method of embodiment 85 comprising storing a predetermined table mapping required physical resources or physical resource characteristics to a range of real time service (RTS) data rates under predetermined channel conditions.
- RTS real time service
- Embodiment 87 The method of embodiment 86 further comprising detecting a new data rate associated with a data flow.
- Embodiment 88 The method of embodiment 87 further comprising dynamically allocating a new set of physical resources to the data flow according to the table and the new data rate.
- Embodiment 89 The method of embodiment 88 further comprising signaling the new set of physical resources.
- Embodiment 90 The method of embodiment 89 wherein the signaling the new set of physical resources is to a second WTRU.
- Embodiment 91 The method of embodiment 90, further comprising receiving an approval signal from the second WTRU.
- Embodiment 92 The method of embodiment 91 further comprising waiting to use the new set of physical resources until the approval signal is received.
- Embodiment 93 The method as in any of embodiment 80-92 configured to operate in a User Equipment (UE) in a long term evolution (LTE) system wherein the second WTRU is configured as an evolved Node B (eNB).
- Embodiment 94 The method as in any of embodiments 86-93 wherein the required physical resources include radio blocks and the required physical resource characteristics include a number of radio blocks.
- Embodiment 95 The method as in any of embodiments 86-94 wherein the predetermined channel conditions include a modulation and coding scheme (MCS).
- MCS modulation and coding scheme
- ROM read only memory
- RAM random access memory
- register cache memory
- semiconductor memory devices magnetic media such as internal hard disks and removable disks, magneto-optical media, and optical media such as CD-ROM disks, and digital versatile disks (DVDs).
- Suitable processors include, by way of example, a general purpose processor, a special purpose processor, a conventional processor, a digital signal processor (DSP), a plurality of microprocessors, one or more microprocessors in association with a DSP core, a controller, a microcontroller, Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) circuits, any integrated circuit, and/or a state machine.
- a processor in association with software may be used to implement a radio frequency transceiver for in use in a wireless transmit receive unit (WTRU), user equipment, terminal, base station, radio network controller, or any host computer.
- WTRU wireless transmit receive unit
- the WTRU may be used in conjunction with modules, implemented in hardware and/or software, such as a camera, a video camera module, a videophone, a speakerphone, a vibration device, a speaker, a microphone, a television transceiver, a hands free headset, a keyboard, a Bluetooth® module, a frequency modulated (FM) radio unit, a liquid crystal display (LCD) display unit, an organic light-emitting diode (OLED) display unit, a digital music player, a media player, a video game player module, an Internet browser, and/or any wireless local area network (WLAN) module.
- modules implemented in hardware and/or software, such as a camera, a video camera module, a videophone, a speakerphone, a vibration device, a speaker, a microphone, a television transceiver, a hands free headset, a keyboard, a Bluetooth® module, a frequency modulated (FM) radio unit, a liquid crystal display (LCD) display unit, an organic light-emit
Abstract
Description
Claims
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