Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L1/00—Arrangements for detecting or preventing errors in the information received
  • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
  • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
  • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
  • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
  • H04L1/1819—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of additional or different redundancy
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L1/00—Arrangements for detecting or preventing errors in the information received
  • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
  • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
• • G—PHYSICS
  • G08—SIGNALLING
  • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
  • G08C25/00—Arrangements for preventing or correcting errors; Monitoring arrangements
  • G08C25/02—Arrangements for preventing or correcting errors; Monitoring arrangements by signalling back receiving station to transmitting station
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L1/00—Arrangements for detecting or preventing errors in the information received
  • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
  • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
  • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W28/00—Network traffic management; Network resource management
  • H04W28/02—Traffic management, e.g. flow control or congestion control
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W24/00—Supervisory, monitoring or testing arrangements
  • H04W24/02—Arrangements for optimising operational condition
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
  • H04W88/02—Terminal devices

Definitions

• the present invention relates to a method, terminal device, and network device for providing redundancy parameters for an automatic repeat request processing at a terminal device of a communication network, particularly for uplink transmissions in a third generation mobile communication network.
• FEC provides correction of the most likely errors and thus avoids the conventional ARQ scheme to stall.
• ARQ could prevent FEC failure.
• the receiver may discard an erroneous transmission before decoding the new one.
• the decoder could benefit from previous attempts to improve the decoding performance of the current one.
• incremental redundancy schemes have been developed, where the first transmission is encoded with a high rate code, and thus low overhead but low protection, and the following trans- missions simply consist of additional redundancy in order to decrease the code rate seen by the receiver.
• WCDMA Wideband Code Division Multiple Access
• UE User Equipment
• Node B a fixed station
• RLC Radio Link Control
• MAC Media Access Control
• BLER Block Error Rate
• the fast H-ARQ concept was introduced to the processing of the High- Speed Downlink Shared Channel (HS-DSCH), where the Node B has full control of the redundancy versions (RV) to be used for transmissions towards a given user, i.e., the standard simply specifies possible RVs but the Node B is free to use any RV and in any order.
• the Node B simply chooses the RV and signals the used RV to the UE on the High-Speed Shared Control Channel (HS-SCCH) just before the transmission of the data on the HS-DSCH using this RV.
• HS-SCCH High-Speed Shared Control Channel
• the simplest solution for RV selection for uplink transmissions would be if this selection was. totally left to the UE. This may, however, cause problems in cases where different Node Bs have different capabilities which the UE should take into account.
• the network may be operated in different ways, e.g. with high or low BLER target, which each may have different optimum RV strategies, such that only sub-optimal network performance is achieved. Further details regarding different redundancy versions and corresponding processing schemes can be gathered from the 3GPP specification TS 25.212.
• a terminal device for applying a redundancy strategy to an automatic repeat request function comprising:
• a network device for providing a commu- nication link to a terminal device; said network device comprising:
• - generating means for generating a strategy information indicating said selected sequence; and - transmitting means for transmitting said strategy information to said terminal device.
• a network operator is able to select the redundancy strategy to be used by the terminal devices simply by selecting a predetermined strategy information and signaling this information to the terminal device.
• the terminal devices do not independently select their own strategies.
• the proposed selection scheme requires less signaling between the network and the terminal device, as only an information indicating the strategy or sequence can be transmitted from the network to the terminal device.
• signaling overhead can be further reduced by simply signaling an information indicating the strategy but not each parameter of the sequence.
• the strategy information may be an index or. a pointer to the selected at least one predetermined sequence.
• the signaling amount merely depends on the number of sequences within the set of predetermined sequences, because the strategy information only needs to specify the index or pointer pointing to the selected ' parameter sequence.
• the transmitting step may be performed by using a higher layer signaling.
• the higher layer signaling may be a Radio Resource Control signaling.
• the use of a higher layer signaling provides the advantage that the lower layer signaling is freed from this additional signaling which reduces transmission delay.
• the transmission step may be performed at the beginning of the connection.
• the redundancy strategy or sequence of redundancy parameters to be used for the specific connection is made available to the terminal device at an early point in time.
• the set of predetermined sequences or strategies may be a predefined fixed set.
• both the terminal device and the network know in advance which redundancy strategies are available, such that a signaling of the spe- cific parameter sequences for each strategy is not required.
• the redundancy parameters may comprise a first parameter defining a self- decodable redundancy version, and a second parameter defining bits which are to be punctured.
• the set of predetermined sequences may comprise sequences relating to at least one of a chase combining strategy, a partial incremental redundancy strategy, and a full incremental redundancy strategy.
• the transmission may be performed by broadcasting the strategy information to all terminal devices located within a predetermined area. Thereby, all terminal devices within the specific area are controlled to use the same redundancy strategy, so that, a good adaptation to a specific capability of this network area can be as- sured.
• the automatic repeat request processing may be performed for data transmission on a dedicated transport channel, e.g. an enhanced uplink dedicated channel of a third generation mobile communication system.
• the terminal device may comprise storing means for storing the set of sequences of redundancy parameters which may have been signaled from the network or which may have been pre-configured due to the respective specifications.
• the network device may comprise storing means for storing the set of sequences of the redundancy parameters, from which a specific sequence can be selected by the selecting means.
• the redundancy parameters used at the terminal ' device may be signaled to the network by using an outband signaling, which does not affect the dedicated data transmission channel.
• the amount of outband information may depend on the selected sequence of redundancy parameters.
• the terminal device may be , configured to set the amount of outband signaling in response to the received strategy information.
• the network de- vice may comprise receiving means for receiving the notification about used redundancy parameters via the outband signaling channel.
• FIG. 1 shows a schematic network architecture with a terminal device and a Node B device according to the preferred embodiments
• Fig. 2 shows a schematic block diagram of a H-ARQ functionality as provided in a terminal device according to the preferred embodiments. DESCRIPTION OF THE PREFERRED EMBODIMENTS
• UMTS Universal Mobile Telecommunications System
• UTRAN Universal Mobile Telecommunications System
• a base station or a Node B 20 terminates the L1 air interface and forwards the uplink traffic from a terminal device or UE 10 to an RNC 30.
• the RNC 30 is responsible for radio resource management (RRM) and controls all radio resources within its part of the UTRAN.
• RRM radio resource management
• the RNC 30 is the key interface partner for the UE 10 and constitutes the interface entity towards a core network 40, e.g.
• Asynchronous Trans- fer Mode is used as the main transport technology for terrestrial interconnection of the UTRAN nodes, i.e. RNCs and Node Bs.
• the UE 10 is connected via the air interface to the Node B 20.
• the Node Bs are connected via respective lub interfaces to the RNCs.
• the Node Bs are logical nodes responsible for radio transmission and reception in one or more cells to/from the UE 10 and terminate the lub interface towards the respective RNC.
• the RNCs provide connections to the core network 40 for circuit-switched (CS) traffic via a lu-CS interface and for packet-switched (PS) traffic via a lu-PS inter- face.
• CS circuit-switched
• PS packet-switched
• a set of at least two RV strategies which define predetermined sequences of RV parameters is provided or selected at the Node B 20.
• the set of RV strategies may be stored in a memory of the Node B 20 or may be derived by the Node B 20 from a network database or the like.
• the Node B 20 signals a strategy information indicating at least one selected RV strategy to the UE 10. Having received the strategy information, the UE 10 is in position to derive the corresponding sequence of RV parameters.
• the memory may be p re-configured based on predetermined network specifications or may be loaded with the parameter sequence(s) in advance by a corresponding signaling information received from the Node B 20.
• the Node B 20 may be configured to select a predetermined parameter sequence and to transmit a strategy information directly comprising the selected parameter sequence.
• the UE 10 may send with each data packet also the actually used RV parameters. This can be advantageous if the network has missed some uplink transmission and therefore does not know which version of a packet (i.e., first, second, third, etc. version) the UE 10 is actually transmitting.
• the RV parameters may be sent by using an outband signaling which is to be understood here as a kind of separate transmission, i.e. not inside the data packet as a header.
• the RV parameters are needed to be able to decode received data packets. Therefore, the RV parameters cannot be sent "in- band", since successful decoding is required to read the packet including the "in- band" header and the RV parameters are needed for this decoding.
• the outband signaling can be transmitted using a separately channel coded header time- multiplexed with the data or using a different code channel or physical channel.
• redundancy versions as specified for HSDPA in the downlink direction.
• the following table indicates eight possible RVs indexed by a sequence of RV values Xrv and specified for QPSK in the 3GPP specification TS 25.212.
• the parame- ter s 1 defines self-decodable redundancy versions, where systematic bits have - 8 -
• Possible RV strategies derived from the above RV parameter values may com- prise, for example, the following three different strategies:
• CC - Chase combining
• PIR Partial Incremental Redundancy
• FIR Full Incremental Redundancy
• the above strategies or sequences of RV parameters can be interpreted as follows.
• the RV strategies can be numbered, e.g., CC could have strategy number "0", PIR could have the strategy number "1 ", and FIR could have the strategy number "2". Of course, also other strategies could be specified and correspondingly numbered.
• the RNC 30 may signal to the UE 10 the RV strategy to be used for the connection, using RRC signaling. Thus, if there are for example four different strategies specified, two bits are needed to signal the strategy using a binary information pattern.
• the RV parameters used in the uplink direction can then be signaled outband by the UE 10, i.e., using an own signaling channel protected separately from the data.
• the number of bits required for transmitting the RV parameters and thus the number of uplink outband information can be made dependent on the selected RV strategy. For instance, if the CC strategy is selected, no signaling is required for the RV parameters, as the RV combination is known for the whole sequence. For PIR, only two bits are needed, as there are only four possible RV parameter combinations. Thus, the number of outband information bits can be reduced if the RV parameters or parameter combination is signaled from the Node B 20 to the UE 10.
• the sequence or RV parameters to be used by the UE 10 is signaled to the UE 10 from the RNC 30 at the beginning or at setup of the connection by using RRC signaling.
• the network may select a predetermined sequence to be used for this connection, e.g., a sequence of ⁇ 0,1,2,4 ⁇ .
• This second preferred embodiment provides the advantage that the network or network operator can define any sequence of RV parameters suitable for a specific application or network environment. However, in this case more bits have to be signaled. In the above example of eight different RV parameter combinations, three bits are required for each RV combination. Thus, if four RV combinations are specified for the sequence, then twelve bits are needed in total to specify the sequence!
• the RV sequences can be specified in the network specification so as to be pre-configurable at the Node B 20 and the UE 10.
• the selected RV strategy can than be cell- or network-specific and can be broad- cast on a common channel.
• the RV strategy is then the same for all UEs in the specific cell or network. If the reason for the use of a certain RV strategy is the Node B capability, for example, and therefore all UEs in the concerned cell should use the same RV strategy, then signaling capacity can be saved if the RV strategy is broadcast to all UEs at the same time.
• Fig. 2 shows a schematic block diagram of a repeat request functionality 100 provided at the UE 10 with an adaptable or controllable RV parameter generating unit 102 which can be controlled based on the strategy information RS received from the network.
• the repeat request functionality 100 can be used for the enhanced uplink DCH (E- DCH) channel or any other physical or transport channel and is configured to match the number of bits of input data Di received from a preceding channel coder to the total number of bits of output data Do.
• the repeat request functionality 100 is controlled, for instance, by the RV parameters s and r indicated in the above table.
• the exact set of bits at the output of the repeat request functionality 100 de- pends on the number of input bits, the number of output bits, and the RV parameters.
• the repeat request functionality 100 comprises two rate-matching stages 106, 110 and a virtual buffer 108. Furthermore, it comprises a bit separation function 104, where systematic bits, first parity bits and second parity bits in the bit sequence input to the first rate matching block 106 are separated into three sequences. Additionally, a bit collection function 112 provides an inverse function to the bit separation function 104. The bit separation function 112 is transparent for convolution- ally encoded transport channels and for turbo encoded transport channels with repetition. Further details regarding the above bit separation function 104, first and second rate matching function 106, virtual buffer unit 108, and bit collection function 112 can be gathered from the 3GPP specification TS 25.212.
• a rate matching rule is applied based on the values of the RV parameters s and r, as specified in the above 3GPP specifi- cation.
• the RV parameter generating function 102 receives the strategy information defining the specific parameter sequence from the network and generates corresponding RV parameter values e.g. as indicated in the above table. This generation may be based on ' a look-up operation, if the sequences are pre-configured and thus stored in the UE 10. This may be the case in the first and third embodiment.
• the parameter generation function 102 may be configured to store the RV sequence signaled from the network in the memory and to successively apply the corresponding RV parameters to the second rate matching function 110.
• the above embodiments can be used to define several strategies for combining, which use different sequences of RV parameter combinations, e.g. self-decodable and/or non-self-decodable. These strategies are either fixed, i.e. defined in the respective specifications, or configurable.
• the network selects one of the strategies and tells it to the UE 10 either at connection setup or broadcasts it to several UEs. Based on the strategy, different signaling principles can be used, e.g. outband signaling with e.g. no RV bits of the strategy CC.
• a set of RV strategies can be defined and the network, e.g. RNC 30 or Node B 20, can easily signal the selected strategy to the UE 10.
• a simple solution of having different RV strategies and the associated signaling can be provided, to inform the UE 10 about the RV, strategy it should use.
• the network can decide which strategies being used. The decision can be based either on the Node B capabilities or on performance issues or any other reasons the network may have.
• a concept of having retransmission strategies defined in semi-static manner in the UE 10 can thus be provided, such that for instance a high-end Node B can tell the connected UEs to use Incremental Redundancy (IR) for retransmissions, while a low-end Node B with limited buffer capabilities can tell the connected UEs to use PIR or even CC for retransmissions.
• IR Incremental Redundancy
• the present invention is not restricted to the above embodiments but can be used in any communication network with any automatic repeat request processing scheme where a terminal device uses a redundancy strategy for ARQ processing.
• any kind of strategy defining a predetermined sequence of redundancy parameters can be signaled.
• the actual scheme to be used on enhanced uplink DCH may be different, e.g., using only one stage.
• the RV parameters may be different from those used for HSDPA. For instance, only one of the above s or r parameters could be used.
• the scheme supports at least two redundancy versions and the sequence of RVs is selectable by the network.
• RVs there could be only two RVs specified, e.g., 0 and 1 (or 2) in the eariier table.
• the possible strategies/sequences could then be, e.g., ⁇ 0,0,0,0 ⁇ and ⁇ 0,1 ,0,1 ⁇ .
• the network would select one of these strategies and signal that to the UE using e.g. downlink RRC signaling.
• the preferred embodiments may thus vary within the scope of the attached claims.

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