WO2009134196A1 - Method and arrangement in a telecommunications system for revoking a semi-persistent scheduling grant or assignment - Google Patents

Method and arrangement in a telecommunications system for revoking a semi-persistent scheduling grant or assignment Download PDF

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Publication number
WO2009134196A1
WO2009134196A1 PCT/SE2009/050428 SE2009050428W WO2009134196A1 WO 2009134196 A1 WO2009134196 A1 WO 2009134196A1 SE 2009050428 W SE2009050428 W SE 2009050428W WO 2009134196 A1 WO2009134196 A1 WO 2009134196A1
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Prior art keywords
physical layer
layer parameters
assignment
semi
scheduling grant
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PCT/SE2009/050428
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French (fr)
Inventor
Johan Torsner
Janne Peisa
Magnus Lindström
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Telefonaktiebolaget L M Ericsson (Publ)
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Publication of WO2009134196A1 publication Critical patent/WO2009134196A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release

Definitions

  • the present invention relates in general to a method and an arrangement in a telecommunications system, and in particular to a method and arrangements for revoking a semi -persistent scheduling grant or assignment in a network node of a telecommunications system.
  • the Hybrid ARQ (HARQ) protocol is deployed in High Speed Downlink Packet Access (HSDPA) and Enhanced Dedicated Channel (E-DCH) in Wideband Code Division Multiple Access (WCDMA).
  • HSDPA High Speed Downlink Packet Access
  • E-DCH Enhanced Dedicated Channel
  • WCDMA Wideband Code Division Multiple Access
  • This protocol which also is planned for Long Term Evolution (LTE) uses an n-channel stop and wait protocol with N parallel HARQ processes.
  • a HARQ process involving a sender and a receiver corresponds to a soft buffer. The receiver needs to know in which process or soft buffer, a received data unit shall be placed in order to correctly perform soft combining with data from other retransmissions.
  • the HARQ operation can be either asynchronous or synchronous.
  • the HARQ process used for transmissions and retransmissions is explicitly signaled on a control channel.
  • the HARQ process is not explicitly signaled.
  • the HARQ process is instead tied to the timing of the transmission, for example to a system frame number.
  • the benefit with a synchronous protocol is that there is no need for out band signaling to indicate the HARQ process. This is particularly important in the uplink (UL) where it is costly in terms of power to achieve a high reliability on the control channel signaling.
  • High Speed packet Access has adopted an asynchronous HARQ protocol in downlink (DL) and a synchronous HARQ protocol in UL.
  • DL downlink
  • UL synchronous HARQ protocol
  • LTE release 8 an asynchronous HARQ protocol in DL and a synchronous HARQ protocol in UL, has accordingly also been adopted. This will also be supported in LTE release 9.
  • the LTE radio access is intended to use scheduled transmission for which shared transmission resources can be assigned to users on a very short time scale.
  • the scheduler deciding on the resource allocation for uplink transmission may be located in the base station that also can be called eNodeB (eNB) in LTE.
  • eNB eNodeB
  • the main mode of operation for the scheduler in LTE is assumed to be dynamic scheduling whereby the base station transmits uplink (UL) scheduling grants to the mobile terminal that also can be called mobile station or user equipment (UE) in LTE.
  • UL uplink
  • UE user equipment
  • the UL scheduling grant can indicate the physical resources that have been allocated to the UEs for uplink transmission, whereas the scheduling assignment can indicate the physical resources that have been allocated to the UEs for downlink reception.
  • the base station may also indicate how the data transmission can be coded and modulated in both UL and DL.
  • HARQ information is not needed for the reason that a synchronous HARQ protocol is assumed for which the HARQ information can be deduced from timing and an initial scheduling grant.
  • HARQ information such as Redundancy Version (RV), New Data Indicator (NDI) and Modulation and Coding Scheme (MCS), may be optionally provided in order to allow overriding of derived information.
  • RV Redundancy Version
  • NDI New Data Indicator
  • MCS Modulation and Coding Scheme
  • Ll IUl control channel which is the Physical Downlink Control Channel (PDCCH), together with the DL scheduling assignment.
  • PDCCH Physical Downlink Control Channel
  • SPS semi-persistent scheduling
  • RRC Radio Resource Control
  • the SPS can be started by transmitting a UL scheduling grant or a DL scheduling assignment, on the Physical Downlink Control Channel (PDCCH) with an indication that the resource scheduling is semi-persistent.
  • PDCCH Physical Downlink Control Channel
  • C-RNTI Cell-Radio Network Temporary Identifier
  • the scheduling grant or assignment is valid in a cyclic manner with the periodicity that was configured via RRC.
  • VoIP Voice over Internet Protocol
  • a transport format For a UL semi-persistent scheduling grant can a transport format be indicated on PDCCH in the same way as for a dynamic scheduling grant.
  • the transport format may comprise one or more of the physical layer parameters: the transport resource block assignment, the modulation and coding scheme, and the redundancy version and the coding scheme.
  • the semi-persistent scheduling grants or assignments are typically only valid for the initial HARQ transmission.
  • the HARQ retransmissions are typically scheduled dynamically with scheduling grants or assignments on PDCCH.
  • the identification of UEs on the PDCCH is done via the Cyclic Redundancy Check (CRC).
  • CRC Cyclic Redundancy Check
  • the UE identity in the form of the C-RNTI is scrambled with a scrambling code such that when a grant or assignment is transmitted on PDCCH only the UE with a given C-RNTI will have a successful CRC check. Other UEs descrambling with a different C-RNTI will thus not obtain a successful CRC check.
  • the eNB sends a dynamic scheduling grant or assignment on PDCCH with the meaning that the semi-persistent scheduling grant or assignment, respectively, shall no longer be valid.
  • a rule may be defined such that the semi-persistent grant is automatically revoked when the radio resources have not been used for a predetermined time. For example, N consecutive semi-persistent sub-frames without transmitted user payload, may trigger the semi-persistent scheduling to be automatically revoked. It should be noted that padding or buffer status reports could still have been transmitted during the N consecutive semi-persistent sub-frames.
  • PDCCH it can happen that the UE erroneously interprets that a received scheduling grant or a downlink scheduling assignment, intended for another UE is in fact intended for itself.
  • Such an error may also occur when for instance pure noise is received by the UE, where there is a non-negligible probability that the CRC check is successful and the UE interprets that the noise is a dynamic scheduling grant intended for it. If this situation occurs, the UE may perceive that the semi-persistent grant is revoked. Obviously this was not intended. This situation can moreover be difficult to detect by the eNB.
  • the alternative of implicit revocation has a disadvantage in that a problem can arise if for instance the application that is using the radio resources in the UE continuously generates payload such that there is no inactivity that can trigger the implicit revocation of the semi- persistent scheduling.
  • a method in a user equipment of a wireless communication system for revoking a semi-persistent scheduling grant or assignment, previously issued by a base station.
  • the semi-persistent scheduling grant or assignment may comprise a first set of physical layer parameters activating a semi-persistent scheduling of the UE.
  • the method can comprise receiving a second set of physical layer parameters from the base station, determining whether at least a subset of the second set of physical layer parameters fulfills a predefined criterion, and revoking the semi-persistent scheduling grant or assignment if the subset of the second set of physical layer parameters fulfills the predefined criterion.
  • the step of determining within the method for revoking a semi-persistent scheduling grant or assignment may further comprise comparing at least the subset of the second set of physical layer parameters with the first set of physical layer parameters.
  • the step of revoking within the method for revoking a semi -persistent scheduling grant or assignment may comprise revoking the semi-persistent scheduling grant or assignment if at least one of the physical parameters of the second set of physical parameters equals a predefined parameter value.
  • the step of revoking within the method for revoking may further comprise revoking the semi -persistent scheduling grant or assignment if at least a subset of second set of physical layer parameters is identical to a subset of the first set of physical layer parameters.
  • the criterion within the method for revocation may comprise a criterion on New Data Indicator, NDI, parameter and a Cell-Radio Network Temporary Identifier, C-RNTI, of a subset of second set of physical layer parameters.
  • the criterion within the method for revocation may comprise that NDI is set to zero.
  • the second set of physical layer parameters, of the method for revoking may be received in a dynamic scheduling grant or assignment on Physical Downlink Control Channel, PDCCH.
  • the semi-persistent scheduling grant within the method for revoking, may comprise an uplink semi-persistent scheduling grant and the dynamic scheduling grant may comprise an uplink dynamic scheduling grant.
  • the semi -persistent scheduling assignment within the method for revoking, may comprise a downlink semi-persistent scheduling assignment and the dynamic scheduling assignment may comprise a downlink dynamic scheduling assignment.
  • a user equipment for revoking a semi-persistent scheduling grant or assignment issued by a base station, wherein the semi-persistent scheduling of the UE may be activated by a first set of physical layer parameters.
  • the UE may comprise a transceiving unit adapted to receive a second set of physical layer parameters from the base station, and a processing unit, operatively connected to the transceiving unit.
  • the processing unit may be adapted to determine whether at least a subset of the second set of physical layer parameters fulfills a predefined criterion, and adapted to revoke the semi-persistent scheduling grant or assignment if the subset of the second set of physical layer parameters fulfills the predefined criterion.
  • the processing unit within the user equipment may further be adapted to compare at least the subset of the second set of physical layer parameters with the first set of physical layer parameters.
  • the processing unit within the user equipment may further be adapted to revoke the semi-persistent scheduling grant or assignment if at least one of the physical layer parameters equals a predefined parameter value.
  • the processing unit within the user equipment may further be adapted to revoke the semi-persistent scheduling grant or assignment if at least a subset of second set of physical layer parameters is identical to a subset of the first set of physical layer parameters.
  • the criterion for the user equipment may comprise a criterion on New Data Indicator, NDI and a Cell-Radio Network Temporary Identifier, C-RNTI, of a subset of the second set of physical layer parameters.
  • a method in a base station for determining revocation of a semi-persistent scheduling grant or assignment having a first set of physical layer parameters previously transmitted to a user equipment, UE, on a Physical Downlink Control Channel, PDCCH.
  • the method may comprise the steps of establishing that the semi-persistent scheduling grant or assignment comprising the first set of physical layer parameters, is to be revoked.
  • the method may also comprise selecting a second set of physical layer parameters fulfilling a predefined criterion for revocation of the semi-persistent scheduling grant or assignment, and may also comprise transmitting a dynamic scheduling grant or assignment to the UE, wherein the dynamic scheduling grant or assignment comprises the second set of physical layer parameters, for revocation of the semi-persistent scheduling grant or assignment by the UE.
  • the predefined criterion in the step of selecting a second set of physical layer parameters fulfilling a predefined criterion may comprise a predefined criterion related to first set of physical layer parameters.
  • the step of selecting may comprise selecting a second set of physical layer parameters of which at least a subset is identical to a subset of the first set of physical layer parameters.
  • the criterion within the method for determining revocation may comprise a criterion on New Data Indicator, NDI, parameter and a Cell-Radio Network Temporary Identifier, C-RNTI, of the second set of physical layer parameters.
  • a base station for establishing revocation of a semi-persistent scheduling grant or assignment comprising a first set of physical layer parameters previously transmitted to a user equipment, UE.
  • the base station may comprise a processing unit adapted to establish that the semi- persistent scheduling grant or assignment comprising the first set of physical layer parameters is to be revoked, and adapted to select a second set of physical layer parameters fulfilling a predefined criterion.
  • the base station may further comprise a transceiving unit adapted to transmit a dynamic scheduling grant or assignment comprising the second set of physical layer parameters to the UE, for revocation of the semi-persistent grant or assignment by the UE.
  • the processing unit of the base station may further be adapted to select the second set of physical layer parameters fulfilling a predefined criterion in relation to the first set of physical layer parameters.
  • the processing unit of the base station may further be adapted to select the second set of physical layer parameters of which at least a subset is identical to a subset of the first set of physical layer parameters.
  • the criterion within the base station may comprise a criterion on New Data Indicator, NDI, parameter and a Cell-Radio Network Temporary Identifier, C-RNTI, of the second set of physical layer parameters.
  • the subset of the second set of physical layer parameters may comprise NDI and a C- RNTI.
  • figure 1 illustrates communicating network nodes of a wireless communication system
  • figure 2 illustrates a basic signaling scheme according to some embodiments of the present invention
  • figures 3 and 4 illustrate each a flow-chart of method steps according to some embodiments of the present invention
  • figures 5 and 6 schematically illustrate network nodes of said wireless communication system.
  • Explicit revocation can be disadvantageous as mentioned above.
  • a user equipment, UE, receiving a scheduling grant may erroneously interpret the grant as being intended for itself, rather than for a different user equipment.
  • a misinterpretation of the identity of the intended user equipment can be a consequence of a relatively short cyclic redundancy check (CRC) code block.
  • An uplink scheduling grant or alternatively a downlink scheduling assignment may thus be interpreted as being intended to a different UE than was in fact intended.
  • a misinterpretation of the receiving UE identity may also occur when for instance pure noise is received by the UE, in the case where there is a non-negligible risk that the CRC check is successful and the UE therefore interprets the noise as a dynamic scheduling grant or assignment intended for it.
  • Misinterpretation of a UE may result in that the UE can perceive that a semi-persistent scheduling grant is to be revoked, although revocation of the semi -persistent scheduling was not intended for that particular UE.
  • SPS semi- persistent scheduling
  • the present invention relates to explicit revocation of UL semi-persistent scheduling, SPS, grants and DL SPS assignments.
  • the present invention concerns a method and arrangement for revoking a semi-persistent scheduling grant or assignment in a network node of a telecommunications system.
  • At least some embodiments of the present invention relates to a method and arrangement in which there is a criterion on which grants or assignments can revoke a valid SPS grant or assignment. Only dynamic grants or assignments that fulfill a certain predefined criterion may revoke a semi persistent grant or assignment.
  • the UE may act on the grant or assignment at the time the grant or assignment is received, although the semi persistent grant or assignment may not be revoked.
  • This allows the eNB to temporarily override the SPS if, for instance, a large packet needs to be transmitted, without the need to setup the SPS again when the large packet has been transmitted. This reduces the number of setting up the SPS, with a reduced number of false alarms as a direct consequence.
  • both the scheduling assignments for downlink data and the scheduling grants for uplink data are sent on PDCCH.
  • the present invention is directed at solutions for an explicit revoking of semi-persistent grants performed via PDCCH. That is, solutions where the eNB may revoke a previously issued semi persistent grant or assignment by sending a normal dynamic scheduling grant or assignment to a UE. In order to avoid that the UE unintentionally revokes the semi persistent grants or assignments due to false alarms, i.e. where the CRC check is successful even if the eNB did not send a message on PDCCH for this UE, additional mechanisms are needed. Such mechanisms are exemplified in the following.
  • a semi persistent grant for the uplink or assignment for the downlink may only be revoked if a dynamic grant or assignment is received where the parameters in the grant or assignment fulfills a predefined criterion.
  • the SPS grant or assignment may be revoked if at least a subset of the physical layer parameters is identical to the physical layer parameters that triggered the semi persistent scheduling.
  • the criterion may comprise one or more of the physical layer parameters of the transport block size, the coding, and the modulation.
  • one or more of the following physical layer parameters may be identical when comparing the two sets of physical layer parameters: the resource block assignment, the hopping resource allocation, the modulation, the coding scheme, and the redundancy version.
  • To fulfill the criterion for the second set of physical layer parameters may according to some embodiments of the present invention comprise that some of the physical layer parameters in the dynamic grant or assignment are equal to the physical layer parameters in the previously sent semi -persistent scheduling grant or assignment, whereas some other parameters may still be different, while fulfilling the criterion.
  • Figure 1 illustrates two network nodes of a wireless telecommunication system, in the form of a user equipment, UE 102 and a base station, as exemplified by an enhanced Node-B or eNB 104.
  • Communication between a UE and an eNB may be realized as illustrated in figure 2, illustrating a basic signaling scheme for signaling between the UE 202 and eNB 204. In the following some embodiments of the present invention will be described in more detail.
  • the UE 202 In the case the UE 202 has data to be transmitted to the eNB 204, the UE 202 requires an allocation of a radio resource in order to be able transmit the data to the eNB 204.
  • the UE can request radio resources in a radio resource request directed to the eNB, for instance in a radio resource request message.
  • the eNB may then determine a semi-persistent scheduling of radio resources, based on the received radio resource request.
  • the eNB 204 can then transmit a UL semi-persistent scheduling grant for the
  • This semi-persistent scheduling grant typically comprises a set of physical layer parameters that can activate the UL semi-persistent scheduling for the UE.
  • the UL SPS grant may be communicated to the UE on the Physical Downlink Control
  • the UE attempts to validate the received SPS grant or assignment by performing for instance a CRC check.
  • the UE can make use of the allocated radio resources to transmit payload in the UL as indicated by step S-212.
  • the semi-persistent scheduling may no longer be desired, for one or more reasons, for instance due to a change in the current application which reduces the need for radio resources.
  • the eNB may then establish that the semi-persistent scheduling is to be revoked, as illustrated in step S-214.
  • the task of the eNB may then be to transmit a message that can be interpreted by the intended UE only without risking misinterpretation of UE identity, thereby eliminating confusion by the UEs receiving the message on PDCCH.
  • a dynamic scheduling grant or assignment may then be transmitted from the eNB 204 on PDCCH to the UE 202, as indicated by step S-216 in figure 2.
  • This dynamic scheduling grant or assignment typically comprises a set of physical layer parameters, which the UE later may use in a step of revoking the SPS grant as will be described down below.
  • the UE can thus receive a dynamic scheduling grant or assignment with a second set of physical layer parameters, after which the method for revoking a semi-persistent scheduling grant or assignment, further may involve a determination whether the set of physical layer parameters from the newly received dynamic scheduling grant or assignment fulfills a predefined criterion, as illustrated in step S-218 of figure 2.
  • the method for revoking a semi-persistent scheduling assignment or grant may involve a comparison between the set of physical layer parameters from the newly received dynamic scheduling grant or assignment and the set of physical layer parameters from the previously received semi- persistent scheduling grant or assignment.
  • the set of physical layer parameters as comprised in the SPS grant or assignment as first received may herein be denoted the first set of physical layer parameters. Consequently, the set of physical layer parameters as comprised in the dynamic scheduling grant or assignment as thereafter received may herein, for the sake of clarity, accordingly be denoted the second set of physical layer parameters.
  • the step of comparing the second set of physical layer parameters comprises comparing at least a subset of the second set of physical layer parameters.
  • the step of comparing may thus comprise comparing at least a subset of the second set of physical layer parameters with the first set of physical layer parameters.
  • step S-220 revocation of the semi -persistent scheduling grant or assignment can be performed, as illustrated in step S-220 in figure 2.
  • revocation of the SPS grant or assignment may be performed if at least one of the physical layer parameters of the second set of physical layer parameters equals a predefined parameter value, at the comparison.
  • the step of revoking the SPS grant or assignment may according to some embodiments of the present invention alternatively be performed if at least a subset of the second set of physical layer parameters is identical to a subset of the first set of physical layer parameters. If the parameter value of each one of a subset of the second set of physical layer parameters is identical to the parameter value of each one of a corresponding subset of the first set of physical layer parameters, the SPS grant or assignment may be revoked.
  • the predefined criterion can be fulfilled when a subset of second physical layer parameters identically matches parameters of a subset of the first set of physical layer parameters.
  • the predefined criterion on the second set of physical layer parameters may comprise a criterion on New Data Indicator, NDI, parameter and a Cell-Radio Network Temporary Identifier, C-RNTI, of the subset of second set of physical layer parameters.
  • a criterion may comprise whether NDI of the second set of physical layer parameters equals NDI of the first set of physical layer parameters, or not.
  • a further criterion may comprise whether NDI of the second set of physical layer parameters equals zero ("0"), or not.
  • a C-RNTI one criterion may comprise whether the C-RNTI of the second set of physical layer parameters equals the C-RNTI of the first set of physical layer parameters, or not.
  • a validation of the semi- persistent scheduling assignment can be made.
  • This validation performed by the UE may in addition to an ordinary CRC check, in which the CRC code block is scrambled with the C-RNTI of the intended UE, comprise a criteria check on physical layer parameters comprising for instance the new data indicator, NDI.
  • Each scheduling grant or assignment may have a Downlink Control Indicator, DCI, format comprising a few physical layer parameters.
  • a criterion for such a scheduling grant or assignment may comprise a criterion on at least a subset of said physical layer parameters.
  • Validation of a scheduling assignment or grant can be established if a criterion on at least a subset of said physical layer parameters is fulfilled.
  • dynamic scheduling grant or assignment fulfills a Downlink Control Indicator, DCI, format specific criterion
  • the dynamic scheduling grant can be validated as a message for revocation or release of the UL SPS grant or alternatively the dynamic scheduling assignment can be validated as a message for revocation or release of a DL SPS assignment.
  • the physical layer parameters of the DCI format may be considered by the UE as having been received with a non-matching CRC.
  • the UE may communicate a payload by using a dynamically scheduled radio resource to the eNB 204 in step S-222, by using the dynamically scheduled radio resource according to the scheduling grant.
  • FIG 3 illustrating a flowchart of method steps of the method for revoking a semi-persistent scheduling grant or assignment by a UE.
  • the UE 202 may receive from the eNB 204 a semi -persistent scheduling grant or assignment in the form of a semi -persistent scheduling grant, comprising a first set of physical layer parameters.
  • the UE 202 may then activate the uplink, UL, SPS grant with the first set of physical layer parameters, in step 304.
  • the method for revoking a semi-persistent scheduling grant or assignment may comprise the step of receiving a dynamic scheduling grant or assignment in the form of a dynamic scheduling grant or assignment comprising a second set of physical layer parameters, step 306. Having access to the second set of physical layer parameters the following step may be the step of determining whether the second set of physical layer parameters fulfills a predefined criterion in step 308.
  • this step of determining may further comprise comparing the second set of physical layer parameters with the first set of physical layer parameters.
  • the UE may then execute the step of revoking the UL semi -persistent scheduling grant or assignment if the second set of physical layer parameters fulfills predefined parameter values, as illustrated in step 310 in figure 3.
  • the UE cannot revoke the UL semi-persistent scheduling grant or assignment.
  • the dynamic scheduling grant or assignment may however be valid at the time of receipt, that is temporarily valid for the specific sub-frames allocated in that dynamic grant or assignment, without revoking the SPS grant or assignment, according to some embodiments of the present invention.
  • This provides the advantage of allowing the eNB via the UE to temporarily override the SPS if, for instance, a large packet needs to be transmitted, without the need to setup the SPS again when the large packet has been transmitted.
  • figure 4 is presented illustrating method steps to be executed in an eNB for revoking a SPS grant or assignment.
  • the eNB may initially transmit a semi-persistent scheduling grant or assignment to the UE, comprising a first set of physical layer parameters, as presented in step 402. It is hence this SPS grant or assignment that can be revoked in the following.
  • the method for establishing revocation may comprise the step of determining that a semi-persistent scheduling grant is to be revoked, step 404.
  • This step may be triggered by a number of different reasons, one being that the UE application no longer demands such radio resources, and that dynamically scheduled resources suffices well.
  • a step of selecting a second set of physical layer parameters for revocation of the semi-persistent scheduling grant, step 406, may follow.
  • This second set of physical layer parameters may be selected such that a predefined criterion can be fulfilled down below.
  • step 408 After the selection of the physical layer parameters the step of transmitting a dynamic scheduling grant or assignment to the UE, step 408, may follow, where said grant or assignment comprises the second set of physical layer parameters.
  • figures 5 and 6 schematically illustrate network nodes in the form of a UE and an eNB base station, respectively.
  • the network node in the form of a UE of a wireless communication system capable of revoking a semi-persistent grant or assignment may comprise means arranged to perform the method for revoking a SPS grant or assignment.
  • the UE 500 in figure 5 comprises a determining or comparing unit 502, a revocation unit 504, and a transceiving unit 506.
  • the UE 500 can also comprise a control unit 506, adapted to control said units.
  • the comparing unit 502 and the revocation unit may be merged into one and the same unit, which may be called the processing unit, potentially also covering the control unit 506.
  • the comparing unit 502, the revocation unit 504, and the transceiving unit 506 as well as the control unit 508, may be operatively connected to each other.
  • the function of the comparing unit 502 when encompassed by the processing unit, may be performed by determining or comparing means of the processing unit.
  • the function of the revocation unit 504 may, when comprised by the processing unit, be performed by revocation means of the processing unit.
  • the determining or comparing unit 502 may be adapted to determine whether the second set of physical layer parameters from the dynamic scheduling grant or assignment fulfills a predefined criterion, corresponding to step 308 as illustrated in figure 3, or alternatively adapted to compare the second set of physical layer parameters from the dynamic scheduling grant or assignment and the first set of physical layer parameters from the SPS grant or assignment,.
  • the revocation unit 504 may be adapted to revoke the SPS grant or assignment under the condition that the second set of physical layer parameters fulfils predefined criterion at the comparison.
  • the criterion may be designed in various ways, a few of which have been mentioned above in connection to the explanation of figure 2.
  • the transceiving unit 506 can be adapted to receive the dynamic scheduling grant or assignment comprising the second set of physical layer parameters.
  • the transceiving unit may have received the SPS grant or assignment comprising the first set of physical layer parameters.
  • the UE 500 may further comprise a control unit 508 adapted to control the steps as executed by the UE.
  • the transceiving unit 506 is also adapted to transmit the UL scheduling resource request, under the control of the control unit 508, to the eNB, once the UE requires a radio resource allocation to transmit data to the eNB.
  • the network node in the form of an eNB of a wireless communication system capable of revoking a semi-persistent grant or assignment may comprise means arranged to perform the method for determining revocation of a SPS grant or assignment.
  • the eNB base station 600 as illustrated in figure 6 may comprise a scheduling unit 602, a formatting unit 604, and a transceiving unit 606.
  • the eNB base station 600 can also comprise a control unit 608, adapted to control said units.
  • the scheduling unit 602 may be adapted to establish that a SPS grant or assignment comprising the first set of physical layer parameters is to be revoked, corresponding to the step 404 as illustrated in figure 4.
  • the formatting unit 604 may be adapted to select a second set of physical layer parameters fulfilling a criterion in relation to the first set of physical layer parameters as comprised in the SPS grant or assignment.
  • the transceiving unit 606 may be adapted to transmit a dynamic scheduling grant or assignment comprising the second set of physical layer parameters to the UE 500 for revocation of a SPS grant or assignment by the UE, corresponding to step 406 as presented in figure 4.
  • the scheduling unit 602, the formatting unit 604, and the transceiving unit 606 can be operatively connected to each other enabling the function of each of the units.
  • the scheduling unit 602 and the formatting unit 604 may the comprised in one processing unit, which additionally also may comprise the control unit 608.
  • the function of the scheduling unit may in this case be performed by scheduling means of the processing unit.
  • the function of the formatting unit may in this case be performed by formatting means for selecting a proper set of physical layer parameters according to embodiments of the present invention.
  • the method steps to be performed by a UE within the embodiments of the present invention may alternatively be implemented by software executed by a processor in a UE.
  • the method steps to be performed by an eNB within the embodiments of the present invention may alternatively be implemented by software executed by a processor in an eNB.
  • Any means mentioned in the present description may be software means, hardware means or a combination thereof.
  • WCDMA Code Division Multiple Access
  • the subset of the second set of physical layer parameters may comprise NDI and the C- RNTI.

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Abstract

The present invention relates to a method and an arrangement, such as a UE (102, 202, 500), for revoking a semi-persistent scheduling grant or assignment, as well as a method and an arrangement, such as an eNB (104, 204, 600), for establishing revocation of a semi-persistent scheduling grant or assignment. A semi-persistent scheduling grant or assignment with a first set of physical layer parameters can activate a semi-persistent scheduling of the UE. The method for revoking can comprise receiving a second set of physical layer parameters (step S-216, step 306), determining whether at least a subset of the second set of physical layer parameters fulfills a predefined criterion (step S-218, step 308), and revoking the semi-persistent scheduling grant or assignment if the subset of the second set of physical layer parameters fulfills the predefined criterion (step S-220, step 310).

Description

METHOD AND ARRANGEMENT IN A TELECOMMUNICATIONS SYSTEM FOR REVOKING A SEMI-PERSISTENT SCHEDULING GRANT OR ASSIGNMENT
TECHNICAL FIELD
The present invention relates in general to a method and an arrangement in a telecommunications system, and in particular to a method and arrangements for revoking a semi -persistent scheduling grant or assignment in a network node of a telecommunications system.
BACKGROUND The Hybrid ARQ (HARQ) protocol is deployed in High Speed Downlink Packet Access (HSDPA) and Enhanced Dedicated Channel (E-DCH) in Wideband Code Division Multiple Access (WCDMA). This protocol, which also is planned for Long Term Evolution (LTE), uses an n-channel stop and wait protocol with N parallel HARQ processes. A HARQ process involving a sender and a receiver corresponds to a soft buffer. The receiver needs to know in which process or soft buffer, a received data unit shall be placed in order to correctly perform soft combining with data from other retransmissions.
Moreover, the HARQ operation can be either asynchronous or synchronous. In the case of asynchronous HARQ operation, the HARQ process used for transmissions and retransmissions is explicitly signaled on a control channel. In the case of synchronous HARQ operation the HARQ process is not explicitly signaled. The HARQ process is instead tied to the timing of the transmission, for example to a system frame number.
The benefit with a synchronous protocol is that there is no need for out band signaling to indicate the HARQ process. This is particularly important in the uplink (UL) where it is costly in terms of power to achieve a high reliability on the control channel signaling.
As a consequence High Speed packet Access (HSPA) has adopted an asynchronous HARQ protocol in downlink (DL) and a synchronous HARQ protocol in UL. In LTE release 8, an asynchronous HARQ protocol in DL and a synchronous HARQ protocol in UL, has accordingly also been adopted. This will also be supported in LTE release 9.
The LTE radio access is intended to use scheduled transmission for which shared transmission resources can be assigned to users on a very short time scale. The scheduler deciding on the resource allocation for uplink transmission may be located in the base station that also can be called eNodeB (eNB) in LTE.
The main mode of operation for the scheduler in LTE is assumed to be dynamic scheduling whereby the base station transmits uplink (UL) scheduling grants to the mobile terminal that also can be called mobile station or user equipment (UE) in LTE.
The UL scheduling grant can indicate the physical resources that have been allocated to the UEs for uplink transmission, whereas the scheduling assignment can indicate the physical resources that have been allocated to the UEs for downlink reception.
The base station may also indicate how the data transmission can be coded and modulated in both UL and DL. For the UL transmission, HARQ information is not needed for the reason that a synchronous HARQ protocol is assumed for which the HARQ information can be deduced from timing and an initial scheduling grant. However, HARQ information, such as Redundancy Version (RV), New Data Indicator (NDI) and Modulation and Coding Scheme (MCS), may be optionally provided in order to allow overriding of derived information.
For DL transmission where an asynchronous HARQ is assumed, information such as HARQ process identity and redundancy version is included on the Ll IUl control channel, which is the Physical Downlink Control Channel (PDCCH), together with the DL scheduling assignment.
The dynamic scheduling requires relatively much signaling overhead. In order to reduce this overhead, it has been decided in 3GPP to support so called semi-persistent scheduling (SPS). In SPS the periodicity of both UL scheduling grant and the DL scheduling assignment is configured via Radio Resource Control (RRC).
The SPS can be started by transmitting a UL scheduling grant or a DL scheduling assignment, on the Physical Downlink Control Channel (PDCCH) with an indication that the resource scheduling is semi-persistent. By using a separate Cell-Radio Network Temporary Identifier (C-RNTI) it can be indicated that the scheduling is semi-persistent.
After receipt of such an indicator the scheduling grant or assignment is valid in a cyclic manner with the periodicity that was configured via RRC. In the case of Voice over Internet Protocol (VoIP) this could for instance mean that the UL scheduling grant or the DL scheduling assignment is valid every 20 ms, or alternatively for instance every 40 ms if packet bundling is desired.
For a UL semi-persistent scheduling grant can a transport format be indicated on PDCCH in the same way as for a dynamic scheduling grant. The transport format may comprise one or more of the physical layer parameters: the transport resource block assignment, the modulation and coding scheme, and the redundancy version and the coding scheme.
The semi-persistent scheduling grants or assignments are typically only valid for the initial HARQ transmission. The HARQ retransmissions are typically scheduled dynamically with scheduling grants or assignments on PDCCH.
It should be noted that the identification of UEs on the PDCCH is done via the Cyclic Redundancy Check (CRC). The UE identity in the form of the C-RNTI is scrambled with a scrambling code such that when a grant or assignment is transmitted on PDCCH only the UE with a given C-RNTI will have a successful CRC check. Other UEs descrambling with a different C-RNTI will thus not obtain a successful CRC check.
The UEs having a non-successful CRC-check, will discard the message on PDCCH. Revocation of uplink semi -persistent grants has been a matter of discussion, from which two alternatives have been defined one which one is explicitly revoking, and the other implicitly revoking.
In the case of explicit revocation the eNB sends a dynamic scheduling grant or assignment on PDCCH with the meaning that the semi-persistent scheduling grant or assignment, respectively, shall no longer be valid.
In the case of implicit revocation, a rule may be defined such that the semi-persistent grant is automatically revoked when the radio resources have not been used for a predetermined time. For example, N consecutive semi-persistent sub-frames without transmitted user payload, may trigger the semi-persistent scheduling to be automatically revoked. It should be noted that padding or buffer status reports could still have been transmitted during the N consecutive semi-persistent sub-frames.
The alternative to implicit revocation, namely explicit revocation has an advantage for the reason that it is simple, as compared to the implicit revocation, and that the eNB has explicit control of the scheduling of radio resources.
However, the explicit revocation may have a problem. Due to the limited CRC length on
PDCCH it can happen that the UE erroneously interprets that a received scheduling grant or a downlink scheduling assignment, intended for another UE is in fact intended for itself.
Such an error may also occur when for instance pure noise is received by the UE, where there is a non-negligible probability that the CRC check is successful and the UE interprets that the noise is a dynamic scheduling grant intended for it. If this situation occurs, the UE may perceive that the semi-persistent grant is revoked. Obviously this was not intended. This situation can moreover be difficult to detect by the eNB.
The alternative of implicit revocation has a disadvantage in that a problem can arise if for instance the application that is using the radio resources in the UE continuously generates payload such that there is no inactivity that can trigger the implicit revocation of the semi- persistent scheduling.
There is thus a need for an improved method and arrangement for revocation of a semi- persistent scheduling that alleviates at least some of the above cited problems.
SUMMARY
It is an object of the present invention to provide revocation of semi -persistent scheduling grants or assignments in a communications system, which at least to a certain extent alleviates unintentional revocation.
According to an aspect of the present invention, there is provided a method in a user equipment of a wireless communication system for revoking a semi-persistent scheduling grant or assignment, previously issued by a base station. The semi-persistent scheduling grant or assignment may comprise a first set of physical layer parameters activating a semi-persistent scheduling of the UE. The method can comprise receiving a second set of physical layer parameters from the base station, determining whether at least a subset of the second set of physical layer parameters fulfills a predefined criterion, and revoking the semi-persistent scheduling grant or assignment if the subset of the second set of physical layer parameters fulfills the predefined criterion.
The step of determining within the method for revoking a semi-persistent scheduling grant or assignment may further comprise comparing at least the subset of the second set of physical layer parameters with the first set of physical layer parameters.
The step of revoking within the method for revoking a semi -persistent scheduling grant or assignment, may comprise revoking the semi-persistent scheduling grant or assignment if at least one of the physical parameters of the second set of physical parameters equals a predefined parameter value. The step of revoking within the method for revoking, may further comprise revoking the semi -persistent scheduling grant or assignment if at least a subset of second set of physical layer parameters is identical to a subset of the first set of physical layer parameters.
The criterion within the method for revocation, may comprise a criterion on New Data Indicator, NDI, parameter and a Cell-Radio Network Temporary Identifier, C-RNTI, of a subset of second set of physical layer parameters.
The criterion within the method for revocation may comprise that NDI is set to zero.
The second set of physical layer parameters, of the method for revoking, may be received in a dynamic scheduling grant or assignment on Physical Downlink Control Channel, PDCCH.
The semi-persistent scheduling grant, within the method for revoking, may comprise an uplink semi-persistent scheduling grant and the dynamic scheduling grant may comprise an uplink dynamic scheduling grant.
The semi -persistent scheduling assignment, within the method for revoking, may comprise a downlink semi-persistent scheduling assignment and the dynamic scheduling assignment may comprise a downlink dynamic scheduling assignment.
According to a second aspect of the present invention, there is provided a user equipment, UE, for revoking a semi-persistent scheduling grant or assignment issued by a base station, wherein the semi-persistent scheduling of the UE may be activated by a first set of physical layer parameters. The UE may comprise a transceiving unit adapted to receive a second set of physical layer parameters from the base station, and a processing unit, operatively connected to the transceiving unit. The processing unit may be adapted to determine whether at least a subset of the second set of physical layer parameters fulfills a predefined criterion, and adapted to revoke the semi-persistent scheduling grant or assignment if the subset of the second set of physical layer parameters fulfills the predefined criterion.
The processing unit within the user equipment may further be adapted to compare at least the subset of the second set of physical layer parameters with the first set of physical layer parameters.
The processing unit within the user equipment may further be adapted to revoke the semi-persistent scheduling grant or assignment if at least one of the physical layer parameters equals a predefined parameter value.
The processing unit within the user equipment may further be adapted to revoke the semi-persistent scheduling grant or assignment if at least a subset of second set of physical layer parameters is identical to a subset of the first set of physical layer parameters.
The criterion for the user equipment may comprise a criterion on New Data Indicator, NDI and a Cell-Radio Network Temporary Identifier, C-RNTI, of a subset of the second set of physical layer parameters.
According to a third aspect of the present invention, there is provided a method in a base station for determining revocation of a semi-persistent scheduling grant or assignment having a first set of physical layer parameters previously transmitted to a user equipment, UE, on a Physical Downlink Control Channel, PDCCH. The method may comprise the steps of establishing that the semi-persistent scheduling grant or assignment comprising the first set of physical layer parameters, is to be revoked. The method may also comprise selecting a second set of physical layer parameters fulfilling a predefined criterion for revocation of the semi-persistent scheduling grant or assignment, and may also comprise transmitting a dynamic scheduling grant or assignment to the UE, wherein the dynamic scheduling grant or assignment comprises the second set of physical layer parameters, for revocation of the semi-persistent scheduling grant or assignment by the UE.
The predefined criterion in the step of selecting a second set of physical layer parameters fulfilling a predefined criterion may comprise a predefined criterion related to first set of physical layer parameters.
The step of selecting may comprise selecting a second set of physical layer parameters of which at least a subset is identical to a subset of the first set of physical layer parameters.
The criterion within the method for determining revocation may comprise a criterion on New Data Indicator, NDI, parameter and a Cell-Radio Network Temporary Identifier, C-RNTI, of the second set of physical layer parameters.
According to a fourth aspect of the present invention, there is provided a base station for establishing revocation of a semi-persistent scheduling grant or assignment comprising a first set of physical layer parameters previously transmitted to a user equipment, UE. The base station may comprise a processing unit adapted to establish that the semi- persistent scheduling grant or assignment comprising the first set of physical layer parameters is to be revoked, and adapted to select a second set of physical layer parameters fulfilling a predefined criterion. The base station may further comprise a transceiving unit adapted to transmit a dynamic scheduling grant or assignment comprising the second set of physical layer parameters to the UE, for revocation of the semi-persistent grant or assignment by the UE.
The processing unit of the base station may further be adapted to select the second set of physical layer parameters fulfilling a predefined criterion in relation to the first set of physical layer parameters. The processing unit of the base station may further be adapted to select the second set of physical layer parameters of which at least a subset is identical to a subset of the first set of physical layer parameters.
The criterion within the base station may comprise a criterion on New Data Indicator, NDI, parameter and a Cell-Radio Network Temporary Identifier, C-RNTI, of the second set of physical layer parameters.
It should be mentioned that intended meaning of "physical layer parameter" comprises the parameter value of the "physical layer parameter".
The subset of the second set of physical layer parameters may comprise NDI and a C- RNTI.
It is explicitly stated that the above aspects of the invention may be combined in the same embodiment.
Among the advantages with embodiments of the present invention is that the risk for unintentionally revoking a semi -persistent grant or assignment is reduced.
BRIEF DESCRIPTION OF DRAWINGS
In order to explain advantages and features of the present invention herein in more detail a few embodiments will be described below, where references are made to the accompanying drawings, for which
figure 1 illustrates communicating network nodes of a wireless communication system; figure 2 illustrates a basic signaling scheme according to some embodiments of the present invention; figures 3 and 4 illustrate each a flow-chart of method steps according to some embodiments of the present invention; and figures 5 and 6 schematically illustrate network nodes of said wireless communication system.
ABBREVIATIONS
CRC Cyclic Redundancy Check
C-RNTI Cell Radio Network Temporary Identifier
DL Downlink
E-DCH Enhanced (uplink) Dedicated Channel
HARQ Hybrid Automatic Repeat reQuest
HSDPA High Speed Downlink Packet Access
LTE Long Term Evolution
TTI Transmission Time Interval
RRC Radio Resource Control
SPS Semi-Persistent Scheduling
UE User Equipment
UL Uplink
VoIP Voice over Internet Protocol
PDCCH Physical Downlink Control Channel WCDMA Wideband Code Division Multiple Access
DETAILED DESCRIPTION
Explicit revocation can be disadvantageous as mentioned above. A user equipment, UE, receiving a scheduling grant may erroneously interpret the grant as being intended for itself, rather than for a different user equipment. A misinterpretation of the identity of the intended user equipment can be a consequence of a relatively short cyclic redundancy check (CRC) code block. An uplink scheduling grant or alternatively a downlink scheduling assignment may thus be interpreted as being intended to a different UE than was in fact intended. A misinterpretation of the receiving UE identity may also occur when for instance pure noise is received by the UE, in the case where there is a non-negligible risk that the CRC check is successful and the UE therefore interprets the noise as a dynamic scheduling grant or assignment intended for it.
Misinterpretation of a UE may result in that the UE can perceive that a semi-persistent scheduling grant is to be revoked, although revocation of the semi -persistent scheduling was not intended for that particular UE. In addition, it is difficult for the eNB to detect that a semi- persistent scheduling (SPS) grant has erroneously been revoked due to a misinterpretation of the identity of the UE.
Hence, the present invention relates to explicit revocation of UL semi-persistent scheduling, SPS, grants and DL SPS assignments.
Briefly described, the present invention concerns a method and arrangement for revoking a semi-persistent scheduling grant or assignment in a network node of a telecommunications system.
At least some embodiments of the present invention relates to a method and arrangement in which there is a criterion on which grants or assignments can revoke a valid SPS grant or assignment. Only dynamic grants or assignments that fulfill a certain predefined criterion may revoke a semi persistent grant or assignment.
Upon receiving a dynamic grant or assignment that does not fulfill the criterion the UE may act on the grant or assignment at the time the grant or assignment is received, although the semi persistent grant or assignment may not be revoked. This allows the eNB to temporarily override the SPS if, for instance, a large packet needs to be transmitted, without the need to setup the SPS again when the large packet has been transmitted. This reduces the number of setting up the SPS, with a reduced number of false alarms as a direct consequence. In the following, various embodiments of the invention will be described and in the following description it should be noted that both the scheduling assignments for downlink data and the scheduling grants for uplink data, are sent on PDCCH.
The present invention is directed at solutions for an explicit revoking of semi-persistent grants performed via PDCCH. That is, solutions where the eNB may revoke a previously issued semi persistent grant or assignment by sending a normal dynamic scheduling grant or assignment to a UE. In order to avoid that the UE unintentionally revokes the semi persistent grants or assignments due to false alarms, i.e. where the CRC check is successful even if the eNB did not send a message on PDCCH for this UE, additional mechanisms are needed. Such mechanisms are exemplified in the following.
According to embodiments of the present invention, a semi persistent grant for the uplink or assignment for the downlink may only be revoked if a dynamic grant or assignment is received where the parameters in the grant or assignment fulfills a predefined criterion.
For example, the SPS grant or assignment may be revoked if at least a subset of the physical layer parameters is identical to the physical layer parameters that triggered the semi persistent scheduling.
The criterion may comprise one or more of the physical layer parameters of the transport block size, the coding, and the modulation.
According to some embodiments of the present invention, one or more of the following physical layer parameters may be identical when comparing the two sets of physical layer parameters: the resource block assignment, the hopping resource allocation, the modulation, the coding scheme, and the redundancy version.
To fulfill the criterion for the second set of physical layer parameters may according to some embodiments of the present invention comprise that some of the physical layer parameters in the dynamic grant or assignment are equal to the physical layer parameters in the previously sent semi -persistent scheduling grant or assignment, whereas some other parameters may still be different, while fulfilling the criterion.
Some embodiments of the present invention will be described with reference to the accompanying figures.
Figure 1 illustrates two network nodes of a wireless telecommunication system, in the form of a user equipment, UE 102 and a base station, as exemplified by an enhanced Node-B or eNB 104.
Communication between a UE and an eNB may be realized as illustrated in figure 2, illustrating a basic signaling scheme for signaling between the UE 202 and eNB 204. In the following some embodiments of the present invention will be described in more detail.
In the case the UE 202 has data to be transmitted to the eNB 204, the UE 202 requires an allocation of a radio resource in order to be able transmit the data to the eNB 204.
For this reason, the UE can request radio resources in a radio resource request directed to the eNB, for instance in a radio resource request message. The eNB may then determine a semi-persistent scheduling of radio resources, based on the received radio resource request.
Having determined that radio resources shall be allocated by using a semi-persistent scheduling, the eNB 204 can then transmit a UL semi-persistent scheduling grant for the
UL radio resource, as is illustrated by step S-210 in figure 2. This semi-persistent scheduling grant typically comprises a set of physical layer parameters that can activate the UL semi-persistent scheduling for the UE.
The UL SPS grant may be communicated to the UE on the Physical Downlink Control
Channel (PDCCH). According to some embodiments of the present invention, the UE attempts to validate the received SPS grant or assignment by performing for instance a CRC check.
Having obtained a SPS grant by the UE 202, the UE can make use of the allocated radio resources to transmit payload in the UL as indicated by step S-212.
Having transmitted the payload to the eNB the semi-persistent scheduling may no longer be desired, for one or more reasons, for instance due to a change in the current application which reduces the need for radio resources. The eNB may then establish that the semi-persistent scheduling is to be revoked, as illustrated in step S-214.
The task of the eNB may then be to transmit a message that can be interpreted by the intended UE only without risking misinterpretation of UE identity, thereby eliminating confusion by the UEs receiving the message on PDCCH.
According to some embodiments of the present invention, a dynamic scheduling grant or assignment may then be transmitted from the eNB 204 on PDCCH to the UE 202, as indicated by step S-216 in figure 2. This dynamic scheduling grant or assignment typically comprises a set of physical layer parameters, which the UE later may use in a step of revoking the SPS grant as will be described down below.
The UE can thus receive a dynamic scheduling grant or assignment with a second set of physical layer parameters, after which the method for revoking a semi-persistent scheduling grant or assignment, further may involve a determination whether the set of physical layer parameters from the newly received dynamic scheduling grant or assignment fulfills a predefined criterion, as illustrated in step S-218 of figure 2.
According to some embodiments of the present invention the method for revoking a semi-persistent scheduling assignment or grant may involve a comparison between the set of physical layer parameters from the newly received dynamic scheduling grant or assignment and the set of physical layer parameters from the previously received semi- persistent scheduling grant or assignment.
The set of physical layer parameters as comprised in the SPS grant or assignment as first received may herein be denoted the first set of physical layer parameters. Consequently, the set of physical layer parameters as comprised in the dynamic scheduling grant or assignment as thereafter received may herein, for the sake of clarity, accordingly be denoted the second set of physical layer parameters.
According to some embodiments of the present invention the step of comparing the second set of physical layer parameters comprises comparing at least a subset of the second set of physical layer parameters.
Thus, the step of comparing may thus comprise comparing at least a subset of the second set of physical layer parameters with the first set of physical layer parameters.
Dependent on the outcome of the comparison revocation of the SPS grant or assignment may be established.
In the case it can be determined that the second set of physical layer parameters at least fulfills a predefined criteria, according to at least some embodiments of the present invention, revocation of the semi -persistent scheduling grant or assignment can be performed, as illustrated in step S-220 in figure 2.
According to some embodiments of the present invention, revocation of the SPS grant or assignment may be performed if at least one of the physical layer parameters of the second set of physical layer parameters equals a predefined parameter value, at the comparison.
The step of revoking the SPS grant or assignment may according to some embodiments of the present invention alternatively be performed if at least a subset of the second set of physical layer parameters is identical to a subset of the first set of physical layer parameters. If the parameter value of each one of a subset of the second set of physical layer parameters is identical to the parameter value of each one of a corresponding subset of the first set of physical layer parameters, the SPS grant or assignment may be revoked.
According to some embodiments of the present invention, the predefined criterion can be fulfilled when a subset of second physical layer parameters identically matches parameters of a subset of the first set of physical layer parameters.
It can moreover be mentioned that the predefined criterion on the second set of physical layer parameters may comprise a criterion on New Data Indicator, NDI, parameter and a Cell-Radio Network Temporary Identifier, C-RNTI, of the subset of second set of physical layer parameters. For example, a criterion may comprise whether NDI of the second set of physical layer parameters equals NDI of the first set of physical layer parameters, or not. A further criterion may comprise whether NDI of the second set of physical layer parameters equals zero ("0"), or not. For a C-RNTI, one criterion may comprise whether the C-RNTI of the second set of physical layer parameters equals the C-RNTI of the first set of physical layer parameters, or not.
According to some embodiments of the present invention, a validation of the semi- persistent scheduling assignment can be made. This validation performed by the UE may in addition to an ordinary CRC check, in which the CRC code block is scrambled with the C-RNTI of the intended UE, comprise a criteria check on physical layer parameters comprising for instance the new data indicator, NDI.
Each scheduling grant or assignment may have a Downlink Control Indicator, DCI, format comprising a few physical layer parameters. A criterion for such a scheduling grant or assignment may comprise a criterion on at least a subset of said physical layer parameters. Validation of a scheduling assignment or grant can be established if a criterion on at least a subset of said physical layer parameters is fulfilled. In case dynamic scheduling grant or assignment fulfills a Downlink Control Indicator, DCI, format specific criterion, the dynamic scheduling grant can be validated as a message for revocation or release of the UL SPS grant or alternatively the dynamic scheduling assignment can be validated as a message for revocation or release of a DL SPS assignment.
In the case the scheduling grant or assignment does not fulfill a DCI format specific criteria, the physical layer parameters of the DCI format, may be considered by the UE as having been received with a non-matching CRC.
Returning to the method steps of the flowchart of figure 2, that is after having revoked the semi-persistent scheduling by a dynamic scheduling grant or assignment, the UE may communicate a payload by using a dynamically scheduled radio resource to the eNB 204 in step S-222, by using the dynamically scheduled radio resource according to the scheduling grant.
Reference will now be made to figure 3, illustrating a flowchart of method steps of the method for revoking a semi-persistent scheduling grant or assignment by a UE.
In step 302 the UE 202 may receive from the eNB 204 a semi -persistent scheduling grant or assignment in the form of a semi -persistent scheduling grant, comprising a first set of physical layer parameters.
The UE 202 may then activate the uplink, UL, SPS grant with the first set of physical layer parameters, in step 304.
According to some embodiments of the present invention the method for revoking a semi-persistent scheduling grant or assignment may comprise the step of receiving a dynamic scheduling grant or assignment in the form of a dynamic scheduling grant or assignment comprising a second set of physical layer parameters, step 306. Having access to the second set of physical layer parameters the following step may be the step of determining whether the second set of physical layer parameters fulfills a predefined criterion in step 308.
According to some embodiments of the present invention, this step of determining may further comprise comparing the second set of physical layer parameters with the first set of physical layer parameters.
The UE may then execute the step of revoking the UL semi -persistent scheduling grant or assignment if the second set of physical layer parameters fulfills predefined parameter values, as illustrated in step 310 in figure 3.
As mentioned above, in the case the second parameter set does not fulfill the criterion, that is, for instance in the case the second parameter set does not fulfill predefined parameter values, the UE cannot revoke the UL semi-persistent scheduling grant or assignment. The dynamic scheduling grant or assignment may however be valid at the time of receipt, that is temporarily valid for the specific sub-frames allocated in that dynamic grant or assignment, without revoking the SPS grant or assignment, according to some embodiments of the present invention.
This provides the advantage of allowing the eNB via the UE to temporarily override the SPS if, for instance, a large packet needs to be transmitted, without the need to setup the SPS again when the large packet has been transmitted.
Having explicitly illustrated method steps to be executed in a UE for revoking a semi- persistent scheduling grant or assignment, figure 4 is presented illustrating method steps to be executed in an eNB for revoking a SPS grant or assignment.
The eNB may initially transmit a semi-persistent scheduling grant or assignment to the UE, comprising a first set of physical layer parameters, as presented in step 402. It is hence this SPS grant or assignment that can be revoked in the following.
According to some embodiments of the present invention, the method for establishing revocation may comprise the step of determining that a semi-persistent scheduling grant is to be revoked, step 404.
This step may be triggered by a number of different reasons, one being that the UE application no longer demands such radio resources, and that dynamically scheduled resources suffices well.
Having established that the SPS grant or assignment is to be revoked in step 404, a step of selecting a second set of physical layer parameters for revocation of the semi-persistent scheduling grant, step 406, may follow. This second set of physical layer parameters may be selected such that a predefined criterion can be fulfilled down below.
After the selection of the physical layer parameters the step of transmitting a dynamic scheduling grant or assignment to the UE, step 408, may follow, where said grant or assignment comprises the second set of physical layer parameters.
Whereas a signaling scheme and flow-charts have been presented in figures 1 -4, figures 5 and 6 schematically illustrate network nodes in the form of a UE and an eNB base station, respectively.
The network node in the form of a UE of a wireless communication system capable of revoking a semi-persistent grant or assignment, may comprise means arranged to perform the method for revoking a SPS grant or assignment.
According to at least some embodiments of the present invention, the UE 500 in figure 5 comprises a determining or comparing unit 502, a revocation unit 504, and a transceiving unit 506. In addition the UE 500 can also comprise a control unit 506, adapted to control said units.
In can be mentioned that the comparing unit 502 and the revocation unit may be merged into one and the same unit, which may be called the processing unit, potentially also covering the control unit 506.
The comparing unit 502, the revocation unit 504, and the transceiving unit 506 as well as the control unit 508, may be operatively connected to each other.
The function of the comparing unit 502, when encompassed by the processing unit, may be performed by determining or comparing means of the processing unit. Likewise, the function of the revocation unit 504 may, when comprised by the processing unit, be performed by revocation means of the processing unit.
The determining or comparing unit 502 may be adapted to determine whether the second set of physical layer parameters from the dynamic scheduling grant or assignment fulfills a predefined criterion, corresponding to step 308 as illustrated in figure 3, or alternatively adapted to compare the second set of physical layer parameters from the dynamic scheduling grant or assignment and the first set of physical layer parameters from the SPS grant or assignment,. The revocation unit 504 may be adapted to revoke the SPS grant or assignment under the condition that the second set of physical layer parameters fulfils predefined criterion at the comparison.
As described above, the criterion may be designed in various ways, a few of which have been mentioned above in connection to the explanation of figure 2.
The transceiving unit 506 can be adapted to receive the dynamic scheduling grant or assignment comprising the second set of physical layer parameters.
Also, the transceiving unit may have received the SPS grant or assignment comprising the first set of physical layer parameters. The UE 500 may further comprise a control unit 508 adapted to control the steps as executed by the UE.
In addition, the transceiving unit 506 is also adapted to transmit the UL scheduling resource request, under the control of the control unit 508, to the eNB, once the UE requires a radio resource allocation to transmit data to the eNB.
The network node in the form of an eNB of a wireless communication system capable of revoking a semi-persistent grant or assignment, may comprise means arranged to perform the method for determining revocation of a SPS grant or assignment.
According to at least some embodiments of the present invention, the eNB base station 600 as illustrated in figure 6 may comprise a scheduling unit 602, a formatting unit 604, and a transceiving unit 606. In addition the eNB base station 600 can also comprise a control unit 608, adapted to control said units.
The scheduling unit 602 may be adapted to establish that a SPS grant or assignment comprising the first set of physical layer parameters is to be revoked, corresponding to the step 404 as illustrated in figure 4.
The formatting unit 604 may be adapted to select a second set of physical layer parameters fulfilling a criterion in relation to the first set of physical layer parameters as comprised in the SPS grant or assignment.
The transceiving unit 606 may be adapted to transmit a dynamic scheduling grant or assignment comprising the second set of physical layer parameters to the UE 500 for revocation of a SPS grant or assignment by the UE, corresponding to step 406 as presented in figure 4. Needless to say the scheduling unit 602, the formatting unit 604, and the transceiving unit 606 can be operatively connected to each other enabling the function of each of the units.
The scheduling unit 602 and the formatting unit 604 may the comprised in one processing unit, which additionally also may comprise the control unit 608. The function of the scheduling unit may in this case be performed by scheduling means of the processing unit. The function of the formatting unit may in this case be performed by formatting means for selecting a proper set of physical layer parameters according to embodiments of the present invention.
It should again be pointed out that the revocation of a SPS grant or assignment is equally applicable both in the downlink as well as the uplink of a wireless system. In the case of a UL SPS grant, this can be revoked by a UL dynamic scheduling grant, whereas in the case of a DL SPS assignment, this scheduling may be revoked by a DL dynamic scheduling assignment.
The method steps to be performed by a UE within the embodiments of the present invention may alternatively be implemented by software executed by a processor in a UE.
The method steps to be performed by an eNB within the embodiments of the present invention may alternatively be implemented by software executed by a processor in an eNB.
Any means mentioned in the present description may be software means, hardware means or a combination thereof.
Any examples and terminology relating to 3GPP LTE standard being used herein should not be seen as limiting the scope of the invention, the methodology of which in principle can be applied to other systems as well, including for instance Wideband Code
Division Multiple Access (WCDMA). While various embodiments and variations of the present invention have been described above, it should be understood that they have been presented by way of example only, and not limitation. Thus, the breadth and scope of the present invention should not be limited by any of the above-described embodiments. Further, unless stated, none of the above embodiments are mutually exclusive. Thus, the present invention may include any combinations and/or integrations of the features of the various embodiments.
Additionally, while the methods described above are shown as a sequence of steps in flow-charts, this was done solely for the sake of illustration. Accordingly, it is contemplated that some steps may be added, some steps may be omitted and the order of the steps may be re-arranged.
It should be mentioned that intended meaning of "physical layer parameter" comprises the parameter value of the "physical layer parameter".
The subset of the second set of physical layer parameters may comprise NDI and the C- RNTI.
It is explicitly stated that the above aspects of the invention may be combined in the same embodiment.
It must be emphasized that the present invention can be varied in many ways. The presented embodiments of the present invention are only a few examples of the variety of embodiments that are comprised within the present invention.
Among the advantages of at least some of the embodiments of the present invention can be mentioned that the risk to unintentionally revoke a semi-persistent grant or assignment, due to misinterpretation of a UE identity, is reduced.

Claims

1. A method in a UE (102, 202, 500) of a wireless communication system for revoking a semi-persistent scheduling grant or assignment, previously issued by a base station (step S-210), said semi-persistent scheduling grant or assignment comprising a first set of physical layer parameters activating a semi -persistent scheduling of the UE, said method comprising: receiving a second set of physical layer parameters from the base station (step S-216, step 306), - determining whether at least a subset of the second set of physical layer parameters fulfills a predefined criterion (step S-218, step 308), and revoking the semi -persistent scheduling grant or assignment if the subset of the second set of physical layer parameters fulfills the predefined criterion (step S-220, step 310).
2. The method according to claim 1, wherein the step of determining further comprises comparing at least the subset of the second set of physical layer parameters with the first set of physical layer parameters (step S-218, step 308).
3. The method according to claim 1 or 2, wherein the step of revoking (step S-220, step 310) further comprises revoking the semi-persistent scheduling grant or assignment if at least one of the physical parameters of the second set of physical parameters equals a predefined parameter value.
4. The method according to any one of claims 1 -3 , wherein the step of revoking
(step S-220, step 310) further comprises revoking the semi-persistent scheduling grant or assignment if at least a subset of second set of physical layer parameters is identical to a subset of the first set of physical layer parameters.
5. The method according to any one of claims 1 -4, wherein the criterion comprises a criterion on New Data Indicator, NDI, parameter and a Cell-Radio Network Temporary Identifier, C-RNTI, of a subset of second set of physical layer parameters.
6. The method according to claim 5, wherein the criterion on NDI is that NDI is set to zero.
7. The method according to any one of claims 1 -6, wherein the second set of physical layer parameters is received in a dynamic scheduling grant or assignment on Physical Downlink Control Channel, PDCCH.
8. The method according to any one of claims 1 -7, wherein the semi-persistent scheduling grant comprises an uplink semi-persistent scheduling grant and the dynamic scheduling grant comprises an uplink dynamic scheduling grant.
9. The method according to any one of claims 1 -7, wherein the semi-persistent scheduling assignment comprises a downlink semi-persistent scheduling assignment and the dynamic scheduling assignment comprises a downlink dynamic scheduling assignment.
10. A user equipment, UE (102, 202, 500), for revoking a semi-persistent scheduling grant or assignment issued by a base station (step S-210), the semi- persistent scheduling of the UE being activated by a first set of physical layer parameters, the UE comprising: a transceiving unit (506) adapted to receive a second set of physical layer parameters (step S-216, step 306) from the base station, and a processing unit (502, 504), operatively connected to the transceiving unit (506), adapted to perform a determination (step S-218, step 308) whether at least a subset of the second set of physical layer parameters fulfills a predefined criterion, and further adapted to revoke the semi-persistent scheduling grant or assignment (step S-220, step 310) if the subset of the second set of physical layer parameters fulfills the predefined criterion.
11. The user equipment (102, 202, 500) according to claim 10, wherein the processing unit (502, 504) further is adapted to compare (step S-218, step 308) at least the subset of the second set of physical layer parameters with the first set of physical layer parameters.
12. The user equipment (102, 202, 500) according to claim 10 or 11, wherein the processing unit (502, 504) further is adapted to revoke the semi-persistent scheduling grant or assignment (step S-220, step 310) if at least one of the physical layer parameters equals a predefined parameter value.
13. The user equipment (102, 202, 500) according to any one of claims 10-12, wherein the processing unit (502, 504) further is adapted to revoke the semi- persistent scheduling grant or assignment (step S-220, step 310) if at least a subset of second set of physical layer parameters is identical to a subset of the first set of physical layer parameters.
14. The user equipment (102, 202, 500) according to any one of claims 9-13, wherein the criterion comprises a criterion on New Data Indicator, NDI and a Cell-Radio Network Temporary Identifier, C-RNTI, of a subset of the second set of physical layer parameters.
15. A method in a base station (104, 204, 600) for establishing revocation of a semi- persistent scheduling grant or assignment having a first set of physical layer parameters previously transmitted (step S-210) to a user equipment, UE, on a
Physical Downlink Control Channel, PDCCH, the method comprising the steps of: establishing that the semi-persistent scheduling grant or assignment (step S-214, step 404) comprising the first set of physical layer parameters, is to be revoked, selecting a second set of physical layer parameters (step S-215, step 406) fulfilling a predefined criterion for revocation of the semi -persistent scheduling grant or assignment, and transmitting a dynamic scheduling grant or assignment (step S-216, step 408) to the UE, wherein the dynamic scheduling grant or assignment comprises the second set of physical layer parameters, for revocation of the semi-persistent scheduling grant or assignment by the UE.
16. The method according to claim 15, wherein the predefined criterion in the step of selecting (step S-215, step 406) a second set of physical layer parameters fulfilling a predefined criterion, comprises a predefined criterion related to first set of physical layer parameters.
17. The method according to claim 15 or 16, wherein the step of selecting (step S- 215, step 406) comprises selecting a second set of physical layer parameters of which at least a subset is identical to a subset of the first set of physical layer parameters.
18. The method according to claim 16 or 17, wherein the criterion comprises a criterion on New Data Indicator, NDI, parameter and a Cell-Radio Network
Temporary Identifier, C-RNTI, of the second set of physical layer parameters.
19. A base station (104, 204, 600) for establishing revocation of a semi-persistent scheduling grant or assignment comprising a first set of physical layer parameters previously transmitted (step S-210) to a user equipment, UE, the base station comprising: a processing unit (602, 604) adapted to establish that the semi-persistent scheduling grant or assignment (step S-214, step 404) comprising the first set of physical layer parameters is to be revoked, and adapted to select a second set of physical layer parameters (step S-215, step 406) fulfilling a predefined criterion, and a transceiving unit (606) adapted to transmit a dynamic scheduling grant or assignment (step S-216, step 408) comprising the second set of physical layer parameters to the UE, for revocation of the semi -persistent grant or assignment by the UE.
20. The base station (104, 204, 600) according to claim 19, wherein the processing unit (602, 604) further is adapted to select the second set of physical layer parameters (step S-215, step 406) fulfilling a predefined criterion in relation to the first set of physical layer parameters.
21. The base station (104, 204, 600) according to claim 19 or 20, wherein the processing unit (602, 604) further is adapted to select the second set of physical layer parameters (step S-215, step 406) of which at least a subset is identical to a subset of the first set of physical layer parameters.
22. The base station (104, 204, 600) according to any one of claims 19-21, wherein the criterion comprises a criterion on New Data Indicator, NDI, parameter and a Cell-Radio Network Temporary Identifier, C-RNTI, of the second set of physical layer parameters.
PCT/SE2009/050428 2008-04-29 2009-04-24 Method and arrangement in a telecommunications system for revoking a semi-persistent scheduling grant or assignment WO2009134196A1 (en)

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