WO2016186542A1 - Procédés pour une procédure d'accès aléatoire, et terminal d'utilisateur, nœud de réseau, programmes d'ordinateur et produits de programme d'ordinateur - Google Patents

Procédés pour une procédure d'accès aléatoire, et terminal d'utilisateur, nœud de réseau, programmes d'ordinateur et produits de programme d'ordinateur Download PDF

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Publication number
WO2016186542A1
WO2016186542A1 PCT/SE2015/050579 SE2015050579W WO2016186542A1 WO 2016186542 A1 WO2016186542 A1 WO 2016186542A1 SE 2015050579 W SE2015050579 W SE 2015050579W WO 2016186542 A1 WO2016186542 A1 WO 2016186542A1
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Prior art keywords
service
user terminal
random access
indicator
network node
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PCT/SE2015/050579
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English (en)
Inventor
Wei Zhao
Ying Sun
Tomas Andreasson
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Telefonaktiebolaget Lm Ericsson (Publ)
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Priority to PCT/SE2015/050579 priority Critical patent/WO2016186542A1/fr
Publication of WO2016186542A1 publication Critical patent/WO2016186542A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access

Definitions

  • the technology disclosed herein relates generally to the field of accessing wireless networks, and in particular to improvements to random access procedures in wireless networks.
  • the main purposes of performing a random access (RA) procedure are to allow a user terminal to obtain new or renewed access to a network and to obtain uplink time synchronization.
  • UE user equipment
  • RRC radio resource control
  • DL downlink
  • UL uplink
  • the random access procedure is made at an incoming handover situation.
  • the random access procedure takes two distinct and different forms: contention based, which is applicable to all scenarios in Table ⁇ contention free, which is applicable only to DL data transmissions and incoming handover.
  • contention based random access (CBRA) procedure also known as the general random access procedure
  • each UEs uses any of the preamble sequences that are common to all UEs. CBRA thus requires signaling to resolve any contention that may have occurred.
  • contention free random access (CFRA) procedure also known as the dedicated, the non-contention based or the contention less random access procedure, the UE uses a preamble sequence that is dedicated for it.
  • FIG 1 illustrates the signaling between the UE and the radio access network (RAN) for the CBRA procedure.
  • RAN radio access network
  • the UE initiates the CBRA procedure by transmitting a randomly selected CBRA preamble from within a CBRA preamble range.
  • the UE receives the CBRA preamble range to use via broadcasting, and in particular via system information block 2 (SIB2).
  • SIB2 system information block 2
  • a network node of the RAN in the figure exemplified by an evolved NodeB (eNB), acknowledges the detected CBRA preamble by transmitting a random access response message (also denoted RA message 2 or RAR).
  • the RA message 2 comprises among other things an initial grant to be used on an uplink shared channel, a timing advance (TA) update and a temporary Cell Radio Network Temporary Identifier (C-RNTI).
  • TA timing advance
  • C-RNTI Cell Radio Network Temporary Identifier
  • the UE uses the grant to transmit, at arrow "Scheduled transmission" (encircled numeral 3), a message (denoted RA message 3) that serves the purpose of verifying that the UE received the RA message 2.
  • the RA message 3 includes information necessary for the purpose of contention resolution.
  • the RAN receives the RA message 3 and performs contention resolution based on the information included in this message. Eventually one UE will detect RA success while other UEs will roll back to do CBRA again.
  • the UE When CBRA is used, the UE randomly chooses the CBRA preamble (within the preamble range) and sends the preamble in a predefined sub-frame using a physical random access channel (PRACH). Multiple UEs may try to use the same PRACH occasion for its CBRA, and all of them will be able to receive the RA message 2.
  • the RA message 2 includes an echoed preamble generated for the RA message 2.
  • the UE receives the RA message 2
  • it compares the echoed preamble with the preamble it used for the random access request transmission (RA message 1). If the echoed preamble matches the one used by the UE, it means this RA message 2 is intended for this particular UE and the UE will proceed to RA message 3.
  • the back-off indicator is sent to all UEs that have sent the RA preamble at a given PRACH occasion, and the back-off time each UE will experience is randomly chosen based on the back-off indicator value.
  • the random back-off time means that the eNB, besides setting the value of the backoff indicator, has very little control over how long time a UE will back-off before performing a second preamble transmission. This may lead to that some UEs with delay critical applications may back-off for a longer time than those with initial attach for instance where the delay is not particularly critical. In other words, there is no means to prioritize and distinguish UEs, for instance in view of quality of service (QoS) and no means to allow shorter random access delay for the UEs with delay critical applications.
  • QoS quality of service
  • VoIP Voice over Internet Protocol
  • KPIs Key Performance indicators
  • the objective is according to a first aspect achieved by a method for a random access procedure performed in a user terminal.
  • the method comprising receiving, from a network node, a back-off indicator relating to a random access attempt, and establishing a randomized back-off time based on the received back-off indicator and on service related information.
  • the method enables reduced random access delay for delay critical data such as VoIP users, and improves both network performance and user experience.
  • the objective is according to an aspect achieved by a computer program for a user terminal for performing a random access procedure.
  • the computer program comprises computer program code, which, when executed on at least one processor on the user terminal causes the user terminal to perform the method as above.
  • the objective is according to an aspect achieved by a computer program product comprising a computer program as above and a computer readable means on which the computer program is stored.
  • the objective is according to an aspect achieved by a user terminal for performing a random access procedure.
  • the user terminal is configured to receive, from a network node, a back-off indicator relating to a random access attempt, and establish a randomized back-off time based on the received back-off indicator and on service related information.
  • the objective is according to an aspect achieved by a method for random access procedure performed in a network node.
  • the method comprises transmitting one or more service related back-off indicators for use by a user terminal in a repeated random access attempt.
  • the network node is enabled to, to some degree, control and tune random access delay based e.g. on the nature of the traffic data.
  • the objective is according to an aspect achieved by a computer program for a network node for a random access procedure.
  • the computer program comprises computer program code, which, when executed on at least one processor on the network node causes the network node to perform the method as above.
  • the objective is according to an aspect achieved by a computer program product comprising a computer program as above and a computer readable means on which the computer program is stored.
  • the objective is according to an aspect achieved by a network node for random access procedure.
  • the network node is configured to transmit one or more service related back-off indicators for use by a user terminal in a repeated random access attempt.
  • Figure 1 is a sequence diagram illustrating a random access procedure.
  • FIG. 2 illustrates schematically an environment in which embodiments of the present disclosure may be implemented.
  • Figure 3 is a flow chart illustrating aspects of the present teachings.
  • Figure 4 illustrates a flow chart over steps of a method in a user terminal in accordance with the present disclosure.
  • Figure 5 illustrates schematically a user terminal and means for implementing methods of the present disclosure.
  • Figure 6 illustrates a flow chart over steps of a method in a network node in accordance with the present disclosure.
  • Figure 7 illustrates schematically a network node and means for implementing methods of the present disclosure.
  • a basic idea of the present teachings is, in case of a preamble transmission failure, to enable differentiation of back-off times based on a priority of a service for which the random access attempt is made.
  • This may, in an aspect, be achieved by providing a means for a network node, e.g. an eNB, to instruct a user terminal about how to generate a back-off time in case of preamble transmission failure.
  • the backoff time may for instance be dependent on Quality of Service Class Indicators (QCIs) of the UE's data transmission.
  • QCIs Quality of Service Class Indicators
  • additional information is, according to this aspect of the present teachings, broadcasted (or transmitted in some other way).
  • This additional information may be broadcasted e.g. in SIB2 as new RA related parameters, serving as a guidance on the back-off time based on QCIs.
  • the new RA related parameter maybe based on the QCI of the UE traffic, and the UE may calculate a back-off time which should reflect the QCI and give shorter delay to delay critical data (e.g. VoIP users).
  • additional RA related parameters are broadcasted, e.g. in SIB2.
  • a UE may, instead of receiving the back-off indicator and additional information from the eNB, rely on internal algorithms and/ or tables to generate back-off times which differentiate between services.
  • Embodiments according to this aspect may be implemented without modification to the eNB,
  • a communications system 1 may comprise a radio access network (RAN) 2 and a core network 3.
  • the core network 3 may in turn be connected to external packet data networks (PDN) 4, e.g. Internet, for instance comprising clusters of servers (in the figure illustrated at reference numeral 8 by a single network node, e.g. a server).
  • PDN packet data networks
  • the RAN 2 may provide wireless communications e.g. according to Long Term
  • the RAN 2 may comprise a number of network nodes 6 arranged to provide the wireless communications for the UEs 5, by conveying traffic to and from the UEs 5 over an air interface.
  • network nodes 6 arranged to provide the wireless communications for the UEs 5, by conveying traffic to and from the UEs 5 over an air interface.
  • eNBs evolved node Bs
  • eNBs are the network nodes providing the wireless communications for the UEs 5 residing within their respective one or more coverage areas.
  • the communications system 1 may comprise a core network 3 to which one or more network nodes 6 of the RAN 2 are connected.
  • core network nodes comprise, in the case of LTE, Mobility Management Entity (MME) handling e.g.
  • MME Mobility Management Entity
  • SGW serving gateway
  • PDN-GW packet data network gateway
  • data flows may be associated with a particular quality-of-service (QoS) class indicator, QCI, which allows for different priority levels to be assigned to different applications, services, users, or data flows, or to guarantee a certain level of performance to a data flow.
  • QCI quality-of-service
  • the back-off time may be based on the particular QCI of the data flow, application, service etc.
  • Figure 3 is a flow chart 20 illustrating aspects of the present teachings. One particular embodiment of the present teachings is described in the following with reference to figure 3.
  • the eNB 6 may for instance broadcast a table with recommended preamble re-transmission delay values for different QCIs together with other RA related parameters.
  • the recommended preamble re-transmission delay values for different QCIs maybe sent together with RA related parameters such as the available set of PRACH resources for the transmission of the RA preamble (prach- Configlndex) or the RA response window size (ra-ResponseWindowSize).
  • This table may e.g. be broadcast in SIB 2.
  • the mapping of QCI to delay may include different delay values for particular QCIs related to delay critical data and a default value for all other QCIs. An example is illustrated in below Table 2:
  • the UE 5 receives the recommended RA preamble retransmission delay values and it may store them.
  • the UE 5 needs to do a CBRA, e.g. due to having lost synchronization to the eNB 6.
  • the UE 5 receives a back-off indicator in the RA message 2 indicating that there is congestion in the RA procedure.
  • the UE 5 may now generate a random back-off time based on the received back-off indicator and on the QCI of Table 2 corresponding to the QCI of the data in its buffer. That is, the UE 5, having received the broadcasted delay values for different services, may establish that e.g. a VoIP call should use delay value Ti. An algorithm may then use the back-off indicator of RA message 2 and the delay Ti corresponding to a QCI of the ongoing service, in this case a VoIP call, and calculate a random back-off time. The calculated random back-off time takes into account that the ongoing service is time critical and that a new RA attempt should therefore be performed with a short back-off time. It is noted that in other embodiments, other service related information than QCI maybe used.
  • such algorithm may comprise obtaining the mean value of the delay back-off TQCI by checking the received Table 2, for QCIs of the data to transmit.
  • the randomness behavior may be introduced by the conventional back-off indicator (I) signaled in the RA message 2.
  • Such random algorithm (Ri) can for instance be normal distribution, Poisson distribution, or a uniform distribution.
  • the UE 5 waits the time t as calculated above, and restarts the preamble transmission when the time has elapsed, e.g. when a timer expires.
  • the UE 5 receives only the conventional back-off indicator from the eNB 6, e.g. the back-off indicator sent in the RA message 2.
  • the UE uses this back-off indicator and an algorithm that is designed to reflect service related information in the back-off delay that it outputs. That is, the UE 5 may apply a random process where the probability distribution is controlled not only by the received back-off indicator, but also by e.g. a priority of the service for which the random access is made, such that low priority services are likely to, or always will, get longer back-off times than high-priority services.
  • seed is used in the below example, and may here be interpreted as a parameter which determines a distribution of random numbers that are generated by an algorithm to which the seed is input.
  • collision of a random access attempt for a service with priority value 1 may generate back-off times with a rectangular (uniform) probability density function ranging from o to i*seed (thus with a mean of seed), whereas a service with priority value 2 may generate back-off times with a
  • new, but optional, parameters may be defined for broadcasting by the eNB 6, e.g. in a SIB.
  • the conventional back-off indicator may also be used. Three cases may be identified:
  • the UE 5 uses these to decide how to prioritize when selecting back-off time for a particular service.
  • the parameters may for instance comprise, for each service category, a multiplier for the conventional back-off indicator. For a time critical service category, the multiplier would then be lower than the multiplier for a less time critical service category.
  • the new optional parameter e.g. the multiplier, is multiplied with the back-off indicator and input to an algorithm, e.g. a conventional random process, that outputs the needed back-off time.
  • the UE 5 may perform a prioritization on its own, as described earlier.
  • the UE 5 may for instance use the seed (which may be the conventional back-off indicator) and apply it in an algorithm designed to take service related information into account, thus obtaining a back-off time.
  • This back-off time maybe seen as a differentiated back-off time, and giving different UEs (with different on-going services) different back-off times, based e.g. on service type.
  • Legacy UEs may of course always use the original back-off parameter without any prioritization, as before.
  • a UE generates a randomized back-off time with a uniform probability distribution from zero up to a time determined by the value of the backoff indicator.
  • differentiation of back-off times maybe made by dividing the range from zero to the time determined by the back-off indicator into sub-ranges for different QCIs (or other values of priority of the service for which the random access attempt is made).
  • a starting percentage or other value determining a position within the range is given.
  • the subrange for that QCI runs from the position determined by the percentage down to the shorter time where another subrange starts, or if there is no such shorter time, down to zero.
  • range may be defined differently, and that any value or set of values that define the subranges may be used.
  • back-off times are generated within the subrange with a uniform probability distribution.
  • the subrange from the top of the full range down to the highest given subrange maybe used.
  • subranges of a full range may be defined for different QCIs and back-off times be generated for each QCI within the corresponding subrange, for example with a uniform distribution.
  • a UE may be preconfigured with values determining the subranges, or such values may be obtained by the UE, for example from the communications system 1.
  • the values may be broadcasted e.g. in a SIB.
  • the widths of the subranges may be chosen to be proportional to the number of random access attempts made for the corresponding QCIs.
  • a standard mix of traffic (usage profile) for the different QCIs may be assumed. Standardizing such a mix may also serve the purpose of preventing that UE implementations are made so as to produce very short back-off times in order to gain an advantage over other UEs, which would be detrimental of the functioning of the communications system 1.
  • the subranges may be dynamically adapted to an actual traffic mix.
  • the obtained information may override the preconfigured information.
  • SIB parameters must not necessarily be implemented or used.
  • SIB parameters it provides an operator of the communications system l with the option to control how (new) UEs will prioritize between services rather than leaving this to the UE implementation as currently standardized (or possibly as chosen by UE vendor). Each operator may thus take its own decision on what services are important.
  • the information controlling how UEs prioritize between services may be transmitted to the UE in various ways; the SIBs are merely an example on how to transmit the information.
  • the UEs implement algorithms for determination of a back-off time in dependence of service priority.
  • Some aspects of such algorithms might become subject to standardization. For instance, it might be advantageous to require that for a standard service usage profile, the generated back-off times should on average over all the services be equal to the average back-off time generated by the known method in which service priority is not taken into account. This will allow new UEs to function better with time-sensitive services, but still restrict UE manufacturers from the temptation to make back-off times shorter in general so as to gain advantages over older UEs and over other manufacturer's UEs. In other words, if the UE wants to up-prioritize some services (giving these services shorter back-off time), it would be required to down-prioritize other services (giving these services longer back-off times), relative to the
  • a standard service usage profile may for instance define a percentage for each QCI. The UE must then generate back-off times such that if random access attempts (or random access collisions) were generated for the QCIs according to the
  • a mechanism is introduced through which the eNB can, to an improved extent, control and tune the random access delay based on QCIs of the data. This is very important from network performance's point of view as well as to meet the QoS requirements.
  • Figure 4 illustrates a flow chart over steps of a method in a user terminal 5 in accordance with the present disclosure.
  • a method 30 for a random access procedure performed in a user terminal 5 comprises receiving 31, from a network node 6, a back-off indicator relating to a random access attempt, in particular a random access attempt that is part of the random access procedure.
  • the method 30 comprises establishing 32 a randomized back-off time based on the received back-off indicator and on service related information.
  • the establishing 32 may comprise using an algorithm having as output the
  • the method 30 may be implemented in a user terminal 5 that is configured to use an existing random access procedure, such as the random access procedure used in LTE.
  • a back-off indicator is received from an eNB and used for determining how long to wait before performing a new random access attempt.
  • the back-off indicator corresponds to a back-off value expressed in number of milliseconds.
  • the user terminal would then back-off a random number or milliseconds between zero and this back-off value; e.g. if the backoff indicator that it receives corresponds to a back-off value on 80 ms, then some user terminal might back off for, say, 50 ms, another for 80 ms and still another for 20 ms.
  • the back-off time is made dependent also on service related information.
  • the method 30 may, in line with the existing methods, be implemented so that the user terminal 5 backs off (i.e. waits) a random number of e.g. milliseconds between zero and the established randomized back-off time (which is based on the back-off indicator that it receives and on the service related
  • the user terminal 5 may wait a random number of milliseconds within an upper limit and a lower limit, both of which maybe based on the received back-off indicator and on service related information.
  • the method 30 provides an advantage in that a user terminal 5 that has an ongoing service that involves time-critical data (e.g. VoIP) can be given a shorter back-off time. This will give fewer users annoyed over interrupted services.
  • time-critical data e.g. VoIP
  • the establishing 32 comprises applying a stochastic process, the probability distribution of which is determined by the received back-off indicator and by the service related information.
  • the stochastic process may for instance be implemented by a pseudorandom sequence as is known in the art.
  • the establishing 32 comprises using the received back-off indicator as input to the stochastic process.
  • the service related information comprises a priority of a service for which the random access procedure is performed and wherein the stochastic process outputs a back-off time having a length related to the priority of the service.
  • the stochastic process may be implemented such that the probability for the length of the back-off time for a time critical application being long is low, the length thereby being related to the service priority. That is, the more time critical the application is, the higher the probability is of obtaining a short back-off time and the lower the probability is of obtaining a long back-off time.
  • the stochastic process should correspondingly be implemented such that the probability of the length being long is higher the less time critical the application is. That is, the less time critical the service is, the lower probability of a short back-off time and the higher probability of a long back-off time.
  • the service related information comprises one or more of: priority of a service for which the random access attempt was made, type of service, time criticality of data to be sent for a service, and a quality-of-service class indicator, QCI, of a data flow in a buffer of the user terminal 5.
  • the service related information may comprise subscription related information, e.g. relate to a subscription tied to the user terminal 5.
  • the subscription may for instance provide information on type of subscription, e.g. it being a high priority subscription which should be given a certain (high) data rate. Based on this, an on-going service of this user terminal 5 should get a short back-off time.
  • service related information is received from the network node 6.
  • the service related information may for instance be broadcasted by the network node, and the user terminal 5 may be configured to receive such broadcasting.
  • the service related information that the user terminal 5 receives from the network node 6 may, for instance, comprise information such as specific indicator values for different services. This information may then be used by the user terminal 5 in order for it to establish the back-off time.
  • the user terminal 5 may for instance identify the current service, i.e. for which the random access attempt was made, and then relate the service to the received specific indicator value for this service.
  • the service related information comprises one or more back-off values corresponding to a respective one or more quality-of- service class indicator, QCI;
  • the back-off indicator relating to a random access attempt comprises the back-off indicator included in a random access response message
  • the establishing 32 comprises establishing the randomized back-off time based on the back-off indicator and on the back-off value of a quality-of-service class indicator, QCI, of data to transmit by the user terminal 5.
  • Figure 5 illustrates schematically a user terminal 5 and means for implementing methods of the present disclosure.
  • the user terminal 5 (comprises a processor 40 comprising any combination of one or more of a central processing unit (CPU), multiprocessor, microcontroller, digital signal processor (DSP), application specific integrated circuit etc. capable of executing software instructions stored in a memory 41 which can thus be a computer program product 41.
  • the processor 40 can be configured to execute any of the various embodiments of the method for instance as described in relation to figure 4.
  • the memory 41 can be any combination of read and write memory (RAM) and read only memory (ROM), Flash memory, magnetic tape, Compact Disc (CD)-ROM, digital versatile disc (DVD), Blu-ray disc etc.
  • the memory 41 also comprises persistent storage, which, for example, can be any single one or combination of magnetic memory, optical memory, solid state memory or even remotely mounted memory.
  • the user terminal 5 also comprises an input/output device 43 (indicated by I/O in figure 5) for communicating with other entities, e.g. with the network node 6.
  • Such input/output device 43 may comprise a communication interface, for instance configured for wireless communication using LTE standards.
  • the user terminal 5 may also comprise receiving circuitry, transmission circuitry, antenna devices etc., as indicated schematically as “Rx/Tx means" in at reference numeral 45.
  • the user terminal 5 may also comprise a data buffer 46 for storing received data and data to be transmitted before further processing thereof.
  • the user terminal 5 may also comprise additional processing circuitry, schematically indicated at reference numeral 44, for implementing the various embodiments of the present teachings.
  • the present teachings provide computer programs 42 for the user terminal 5.
  • the computer programs 42 comprises computer program code, which, when executed on at least one processor 40 on the user terminal 5 causes the user terminal 5 to perform the method 30 according to any of the described embodiments thereof.
  • the present disclosure also encompasses computer program products 41 comprising a computer program 42 for implementing the embodiments of the method as described, and a computer readable means on which the computer program 42 is stored.
  • the computer program product 41 may, as mentioned earlier, be any combination of random access memory (RAM) or read only memory (ROM), Flash memory, magnetic tape, Compact Disc (CD)-ROM, digital versatile disc (DVD), Blu- ray disc etc.
  • a user terminal 5 is provided for performing a random access procedure.
  • the user terminal 5 is configured to: - receive, from a network node 6, a back-off indicator relating to a random access attempt, and
  • the user terminal 5 may be configured to perform the above steps e.g. by comprising a processor 40 and memory 41, the memory 41 containing instructions executable by the processor 40, whereby the user terminal 5 is operative to perform the steps.
  • the user terminal 5 is configured to establish by applying a stochastic process, the probability distribution of which is determined by the received back-off indicator and by the service related information.
  • the user terminal 5 is configured to establish by using the received back-off indicator as input to the stochastic process.
  • the service related information comprises a priority of a service for which the random access procedure is performed and wherein the stochastic process outputs a back-off time having a length related to the priority of the service.
  • the service related information comprises one or more of: priority of a service for which the random access attempt was made, type of service, time criticality of data to be sent for a service, and a quality-of-service class indicator, QCI, of a data flow in a buffer of the user terminal 5.
  • the user terminal 5 is configured to receive service related information from the network node 6.
  • the user terminal 5 may for instance be configured to receive some broadcast information comprising the service related information.
  • the service related information comprises one or more back-off values corresponding to a respective one or more quality-of- service class indicator, QCI;
  • the back-off indicator relating to a random access attempt comprises the back-off indicator included in a random access response message
  • the user terminal 5 is configured to establishing the randomized back- off time based on the back-off indicator and on the back-off value of a quality-of- service class indicator, QCI, of data to be transmitted by the user terminal 5.
  • the user terminal 5 is configured to await the established randomized back-off time before performing a new random access attempt.
  • the computer program products, or the memories comprises instructions executable by the processor 40.
  • Such instructions maybe comprised in a computer program, or in one or more software modules or function modules.
  • means are provided, e.g. function modules, that can be implemented using software instructions such as computer program executing in a processor and/ or using hardware, such as application specific integrated circuits, field programmable gate arrays, discrete logical components etc., or any combination thereof.
  • a user terminal 5 for performing a random access procedure.
  • the user terminal 5 comprises first means for receiving, from a network node 6, a back-off indicator relating to a random access attempt.
  • Such first means may for instance comprise an input/output device as described earlier, e.g. a communication interface, and/ or it may comprise any type of processing circuitry for receiving data (e.g. processing circuitry 44 adapted for such reception).
  • the user terminal 5 comprises second means for establishing a randomized back-off time based on the received back-off indicator and on service related information.
  • Such second means may for instance comprise processing circuitry adapted to perform such establishing.
  • the user terminal 5 may comprise additional means for implementing the various steps and algorithms that have been described.
  • Figure 6 illustrates a flow chart over steps of a method 50 in a network node in accordance with the present teachings.
  • the method 50 for random access procedure may be performed in a network node 6.
  • the method 50 comprises transmitting 51 one or more service related back-off indicators for use by a user terminal 5 in a repeated random access attempt.
  • the network node is enabled to, to some degree, control and tune random access delay based e.g. on the nature of the traffic data.
  • the service related back-off indicator is based on one or more of: priority of a service, type of service, time criticality of a service, and a quality-of-service class indicator, QCI, corresponding to a service requested by a user terminal 5.
  • the transmitting 51 comprises broadcasting the one or more service related back-off indicators in system block information 2, SIB2.
  • Figure 7 illustrates schematically a network node and means for implementing methods of the present disclosure.
  • the network node 6 comprises a processor 60 comprising any combination of one or more of a central processing unit (CPU), multiprocessor, microcontroller, digital signal processor (DSP), application specific integrated circuit etc. capable of executing software instructions stored in a memory 61 which can thus be a computer program product 61.
  • the processor 60 can be configured to execute any of the various embodiments of the method for instance as described in relation to figure 6.
  • the memory 61 can be any combination of read and write memory (RAM) and read only memory (ROM), Flash memory, magnetic tape, Compact Disc (CD)-ROM, digital versatile disc (DVD), Blu-ray disc etc.
  • the memory 61 also comprises persistent storage, which, for example, can be any single one or combination of magnetic memory, optical memory, solid state memory or even remotely mounted memory.
  • the network node 6 may also comprise an input/output device 63 (indicated by I/O in figure 7) for communicating with other entities.
  • Such input/output device 63 may for instance comprise a communication interface, for instance configured for wireless communication using LTE standards.
  • the network node 6 may also comprise an antenna system 65 comprising antenna devices, receiving circuitry, transmission circuitry, processing circuitry, etc.
  • the input/ output device 63 may also comprise an interface for a wired communication with other network nodes.
  • the network node 6 may also comprise additional processing circuitry, schematically indicated at reference numeral 64, for implementing the various embodiments according to the present teachings.
  • the present teachings provide computer programs 62 for the network node 6.
  • the computer programs 62 comprises computer program code, which, when executed on at least one processor 60 on the network node 6 causes the network node 6 to perform the method 50 according to any of the described embodiments thereof.
  • the present disclosure also encompasses computer program products 61 comprising a computer program6 for implementing the embodiments of the method as described, and a computer readable means on which the computer program 62 is stored.
  • the computer program product 61 may, as mentioned earlier, be any combination of random access memory (RAM) or read only memory (ROM), Flash memory, magnetic tape, Compact Disc (CD)-ROM, digital versatile disc (DVD), Blu- ray disc etc.
  • a network node 6 is provided for random access procedure.
  • the network node 6 is configured to transmit one or more service related back-off indicators for use by a user terminal 5 in a repeated random access attempt.
  • the network node 6 maybe configured to perform a conventional random access procedure, e.g. as described in relation to figure 1.
  • the network node 6 also broadcasts at least one service related back-off indicator, which maybe received and used by user terminals 5 for calculating a randomized back-off time before sending a new random access request.
  • the network node 6 may thereby ensure, at least to some extent, that access requests from UEs with time critical applications are given shorter back-off times than UEs with less time critical applications or UEs making an initial access request. This can be ensured e.g. by selecting the service related back-off indicators to be transmitted in a corresponding way.
  • the network node 6 may be configured to perform the above step e.g. by comprising a processor 60 and memory 61, the memory 61 containing instructions executable by the processor 60, whereby the network node 6 is operative to perform the step.
  • the service related back-off indicator is based on one or more of: priority of a service, type of service, time criticality of a service, and a quality-of-service class indicator, QCI, corresponding to a service requested by a user terminal 5.
  • the network node 6 is configured to transmit by broadcasting the one or more service related back-off indicators in system block information 2, SIB2.
  • the computer program products, or the memories comprises instructions executable by the processor 60.
  • Such instructions maybe comprised in a computer program, or in one or more software modules or function modules.
  • means are provided, e.g. function modules, that can be implemented using software instructions such as computer program executing in a processor and/ or using hardware, such as application specific integrated circuits, field programmable gate arrays, discrete logical components etc., or any combination thereof.
  • a network node for random access procedure.
  • the network node comprises first means for transmitting one or more service related back-off indicators for use by a user terminal in a repeated random access attempt.
  • Such first means may for instance comprise an input/ output device as described earlier, e.g. a communication interface, and/ or it may comprise any type of processing circuitry for transmitting data, and/or an antenna system as described earlier.
  • It provides a means for the eNB to control and tune random access delay based on the nature of the traffic data.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé (30) pour une procédure d'accès aléatoire exécutée dans un terminal d'utilisateur (5). Le procédé (30) comprend les étapes suivantes : réception (31), de la part d'un nœud de réseau (6), d'un indicateur de réduction de puissance relatif à une tentative d'accès aléatoire, et établissement (32) d'un temps de réduction de puissance aléatoire en se basant sur l'indicateur de réduction de puissance reçu et sur des informations en rapport avec le service. L'invention concerne également un procédé (50) dans un nœud de réseau (6), un terminal d'utilisateur (5), un nœud de réseau (6) ainsi que des programmes d'ordinateur et des produits de programme d'ordinateur correspondants.
PCT/SE2015/050579 2015-05-20 2015-05-20 Procédés pour une procédure d'accès aléatoire, et terminal d'utilisateur, nœud de réseau, programmes d'ordinateur et produits de programme d'ordinateur WO2016186542A1 (fr)

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EP3565366A4 (fr) * 2017-01-23 2019-12-18 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Procédé d'accès aléatoire, dispositif terminal, et dispositif de réseau
US11166318B2 (en) 2017-01-23 2021-11-02 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Method for random access, and terminal device and network device
US11057804B2 (en) 2017-03-22 2021-07-06 Lg Electronics Inc. Method and device for adjusting random access backoff parameter
EP3606267A4 (fr) * 2017-03-22 2021-01-06 LG Electronics Inc. Procédé et dispositif pour l'ajustement d'un paramètre de réduction de puissance d'accès aléatoire
EP3607801A4 (fr) * 2017-04-04 2020-11-25 LG Electronics Inc. -1- Appareil et procédé de réalisation d'une procédure d'accès aléatoire
CN110800357A (zh) * 2017-08-11 2020-02-14 华为技术有限公司 信号传输方法、相关装置及系统
WO2019029423A1 (fr) * 2017-08-11 2019-02-14 华为技术有限公司 Procédé d'émission de signal, dispositif et système associés
US11387956B2 (en) 2017-08-11 2022-07-12 Huawei Technologies Co., Ltd. Signal transmission method, related apparatus, and system
CN109729600B (zh) * 2017-10-27 2021-06-08 维沃移动通信有限公司 一种无线资源的管理方法和基站
CN109729600A (zh) * 2017-10-27 2019-05-07 维沃移动通信有限公司 一种无线资源的管理方法和基站
EP3613252A4 (fr) * 2018-01-25 2020-03-25 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Procédé d'accès aléatoire, procédé d'accès sans fil, dispositif sans fil et appareil de noeud
EP3873163A1 (fr) * 2018-01-25 2021-09-01 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Procédé d'accès aléatoire, dispositif sans fil
US11134519B2 (en) 2018-01-25 2021-09-28 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Method and wireless device for transmitting random access preamble
WO2021077343A1 (fr) * 2019-10-23 2021-04-29 Oppo广东移动通信有限公司 Procédé de communication sans fil et dispositif terminal
WO2023247534A1 (fr) * 2022-06-24 2023-12-28 Continental Automotive Technologies GmbH Système, procédé, équipement utilisateur et station de base pour effectuer un transfert dans un réseau sans fil

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