WO2012065487A1 - Procédé, terminal, dispositif et système permettant de réaliser un équilibrage de charge de porteuse - Google Patents

Procédé, terminal, dispositif et système permettant de réaliser un équilibrage de charge de porteuse Download PDF

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Publication number
WO2012065487A1
WO2012065487A1 PCT/CN2011/080729 CN2011080729W WO2012065487A1 WO 2012065487 A1 WO2012065487 A1 WO 2012065487A1 CN 2011080729 W CN2011080729 W CN 2011080729W WO 2012065487 A1 WO2012065487 A1 WO 2012065487A1
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Prior art keywords
carrier
reverse
terminal
carriers
mapping
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PCT/CN2011/080729
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English (en)
Chinese (zh)
Inventor
许明霞
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华为技术有限公司
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Publication of WO2012065487A1 publication Critical patent/WO2012065487A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/08—Load balancing or load distribution
    • H04W28/082—Load balancing or load distribution among bearers or channels

Definitions

  • the present invention relates to the field of wireless communications technologies, and in particular, to a method, a terminal, a device, and a system for implementing carrier load balancing.
  • a terminal often adopts a contention-based random access method to implement reverse access. Since the reverse access channel is a single shared channel, and each terminal device can randomly initiate an access process according to its own wishes, if two or more terminal devices simultaneously send access information, the uplink of the spatial interface The signals will interfere with each other, which will cause the receiving end to not correctly identify the originating signals. This situation is called random access collision.
  • the way to resolve the collision is to initiate an access attempt after a period of time, until the access is successfully reached or the maximum number of access attempts is reached.
  • This collision can increase the terminal access time, resulting in additional power consumption and user experience, and a higher access channel load and lower average random access performance. Therefore, it is necessary to achieve load balancing on each carrier wave to avoid a large delay and power consumption caused by a large number of terminals connected to a certain carrier.
  • mapping algorithm that is, the channel selection algorithm, can ensure that a large number of terminals are evenly distributed on each forward carrier, and both the terminal and the network side support the mapping algorithm.
  • the mapping algorithm is used for channel selection by the terminal and the network side respectively (due to the technology) After each carrier has one channel, and thus the corresponding forward carrier is selected and the corresponding channel is selected, the terminal and the network side agree on the result of the terminal mapping and camping on which forward carrier. Thereafter, the terminal receives downlink information from the forward channel of the camped forward carrier, and transmits uplink information on a reverse channel of the corresponding carrier (ie, the reverse carrier corresponding to the forward carrier). Specifically, the mapping algorithm uses the feature values of each terminal as a seed, and then maps each terminal to the fan by using a hash algorithm. All forward channels on the zone.
  • the forward carrier is mapped by the above method, resulting in unbalanced load of each reverse carrier.
  • traditional human-to-human (H2H) communication is mainly located in the network, that is, the downlink traffic is much larger than the uplink, the existing protocol only supports the number of forward carriers greater than the number of reverse carriers.
  • the air interface specification of multi-carrier EVDO rev. B such as 3GPP2, supports the case where the number of forward carriers in the sector does not match the number of reverse carriers. Assume that the corresponding relationship between the forward carrier and the reverse carrier broadcasted by the network side in the overhead message is as shown in FIG.
  • the number of forward carriers is greater than the number of reverse carriers, and the forward carrier fO corresponds to the reverse carrier fO, and the forward direction
  • the carrier f 1 corresponds to the reverse carrier f 1
  • both the forward carrier f2 and the forward carrier f3 correspond to the reverse carrier f2.
  • the terminal When the terminal obtains that it should and has camped on the forward carrier f3 via the hash algorithm, if the terminal initiates random access, the terminal initiates access on the corresponding reverse carrier f2.
  • the random access load on the three reverse carriers is not uniform from the statistical probability point of view.
  • the load on the reverse carrier f2 is higher.
  • Reverse carrier fO and reverse carrier f 1 That is, the average congestion condition of the random access on the reverse carrier f2 is more serious than that of the reverse carrier fO and the reverse carrier fl, that is, load balancing between the reverse carriers (i.e., random access channels) in the cell cannot be achieved.
  • the number of reverse carriers is greater than the number of forward carriers
  • the amount of uplink information is much larger than the amount of downlink information.
  • M2M or MTC emerging Internet of Things
  • network communication between one or more network elements does not require human involvement.
  • the Internet of Things based on cellular wireless communication utilizes existing cellular wireless networks to connect various intelligent terminals to realize the transmission of various services.
  • the number of potential terminals participating in M2M communication is very large, although the interaction traffic of each terminal may be very small, but the interaction may be random and bursty.
  • M2M terminals With the rapid spread of M2M applications, there will be a large number of M2M terminals in the same cell. Although the data volume of M2M communication is much smaller than that of H2H communication in most cases, it is required to be accessed simultaneously in some large-scale M2M devices. In the scenario, random access resources cannot meet the requirements, and even affect the normal access of H2H. Such as automatic meter reading based on smart grid The power dispatching service, a large number of collisions, makes the access delay beyond the acceptance range, affecting other normal services. Even if the M2M service is independently networked, the random access channel may be seriously congested due to simultaneous access of a large number of devices. In the M2M communication, the information is located at the terminal.
  • the number of uplink communication and the amount of information are much larger than the downlink.
  • the performance of the uplink random access channel becomes a bottleneck of system performance, and the number of reverse carriers is bound to be amplified and greater than the number of forward carriers (as shown in FIG. 8B).
  • the load balancing between the respective reverse carriers is more demanding.
  • Embodiments of the present invention provide a method, a terminal, a device, and a system for implementing carrier load balancing to implement load balancing between reverse carriers.
  • the embodiment of the invention provides a method for implementing carrier load balancing, which includes:
  • the terminal is mapped to a reverse carrier by using a mapping algorithm in a part or all of the reverse carrier range, where the one reverse carrier mapped to the plurality of forward carriers is used;
  • the terminal maps to one of the partial or all forward carriers by a mapping algorithm in part or all of the forward carrier range.
  • the embodiment of the invention further provides a method for implementing carrier load balancing, which includes:
  • the terminal is mapped to a forward carrier by using a mapping algorithm in a part or all of the forward carrier range, where the forward carrier corresponding to the mapping corresponds to multiple reverse carriers;
  • the terminal maps to one of the partial or all of the reverse carriers by a mapping algorithm in part or all of the reverse carrier range.
  • the embodiment of the invention further provides a method for implementing carrier load balancing, which includes:
  • the network side obtains a reverse carrier used by the terminal by using a mapping algorithm in a part or all of the reverse carrier; wherein the obtained one reverse carrier corresponds to multiple forward carriers;
  • the network side obtains one of the part or all of the forward carriers used by the terminal by using a mapping algorithm in a part or all of the forward carrier range.
  • the embodiment of the invention further provides a terminal for implementing carrier load balancing, which includes: a reverse mapping unit, configured to map to a reverse carrier by using a mapping algorithm in a part or all of the reverse carrier range; wherein, the one reverse carrier mapped to the multiple forward carriers; the forward mapping unit And for mapping to one of the some or all of the forward carriers by a mapping algorithm in a part or all of the forward carrier range.
  • a reverse mapping unit configured to map to a reverse carrier by using a mapping algorithm in a part or all of the reverse carrier range; wherein, the one reverse carrier mapped to the multiple forward carriers; the forward mapping unit And for mapping to one of the some or all of the forward carriers by a mapping algorithm in a part or all of the forward carrier range.
  • the embodiment of the present invention further provides a terminal for implementing carrier load balancing, including: a forward mapping unit, configured to map to a forward carrier by using a mapping algorithm in a part or all of a forward carrier range; The forward carrier mapped to the plurality of reverse carriers; the reverse mapping unit, configured to map to one of the partial or all reverse carriers by a mapping algorithm in a part or all of the reverse carrier range On the carrier.
  • a forward mapping unit configured to map to a forward carrier by using a mapping algorithm in a part or all of a forward carrier range
  • the forward carrier mapped to the plurality of reverse carriers
  • the reverse mapping unit configured to map to one of the partial or all reverse carriers by a mapping algorithm in a part or all of the reverse carrier range On the carrier.
  • the embodiment of the present invention further provides a network side device for implementing carrier load balancing, including: a reverse carrier acquiring unit, configured to obtain a reverse used by the terminal by using a mapping algorithm in a part or all of the reverse carrier range a carrier; wherein the obtained one reverse carrier corresponds to multiple forward carriers;
  • a forward carrier acquiring unit configured to obtain, by using a mapping algorithm, one of the part or all of the forward carriers used by the terminal in a part or all of the forward carrier range.
  • the embodiment of the present invention further provides a wireless communication system, including the foregoing terminal for implementing carrier load balancing and the network side device for implementing carrier load balancing.
  • the method, the terminal, the device and the system for implementing the carrier load balancing provided by the embodiment of the present invention are mapped to a reverse carrier by using a mapping algorithm in the at least part of the reverse carrier range of the reverse carrier, so that the When an M2M application or an intelligent terminal uses a random access channel, each terminal uses a mapping algorithm to map to one of the reverse carriers. Since the mapping algorithm has uniformity or equal probability characteristics, the number of terminals mapped by each reverse carrier can be ensured to be close. Even the same, so that the number of terminals that initiate random access on each reverse carrier is close to or even the same, that is, the load between the random access channels is equalized, and load balancing between the reverse carriers is achieved.
  • FIG. 1 is a flowchart of a method for implementing carrier load balancing according to Embodiment 1 of the present invention
  • FIG. 2 is a flowchart of a method for implementing carrier load balancing on a network side corresponding to the embodiment shown in FIG. 1 according to an embodiment of the present invention
  • FIG. 3 is a flowchart of a method for implementing carrier load balancing according to Embodiment 2 of the present invention
  • FIG. 4 is a schematic structural diagram of a terminal used for implementing the method for implementing carrier load balancing according to an embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of a network side device used in the foregoing method for implementing carrier load balancing according to an embodiment of the present disclosure
  • FIG. 6 is a schematic structural diagram of another terminal used in the foregoing method for implementing carrier load balancing according to an embodiment of the present disclosure
  • FIG. 7 is a schematic structural diagram of a wireless communication system according to an embodiment of the present invention.
  • FIG. 8A is a schematic diagram of a correspondence relationship when the number of forward carriers is greater than the number of reverse carriers;
  • FIG. 8B is a schematic diagram of the correspondence relationship when the number of reverse carriers is greater than the number of forward carriers.
  • FIG. 1 is a flowchart of a method for implementing carrier load balancing according to Embodiment 1 of the present invention. As shown in Figure 1, it includes:
  • Step 11 The terminal maps to a reverse carrier by using a mapping algorithm in a part or all of the reverse carrier range, where the one reverse carrier mapped to the multiple forward carriers.
  • the idle state terminal may map itself to a certain reverse carrier within the reverse carrier using a mapping algorithm in all reverse carrier ranges.
  • the mapping algorithm may be a modulo algorithm, a hash algorithm, or the like.
  • the terminal may map itself to a certain reverse carrier within the part of the reverse carrier using a mapping algorithm within a portion of the reverse carrier. For example, operators want to communicate with M2M and H2H.
  • Use a mapping algorithm Use a mapping algorithm.
  • Step 12 The terminal maps to one of the part or all of the forward carriers by a mapping algorithm in a part or all of the forward carrier range.
  • the mapping algorithm is used in all corresponding forward carriers to map itself to one of the forward carriers.
  • the correspondence between the forward carrier and the reverse carrier can be obtained by a sector parameter message broadcast by a network side device such as a base station.
  • the terminal may also map within all forward carrier ranges within the sector; or the terminal may map within a portion of the forward carrier range within the sector, such as within a portion of the forward carrier range of the M2M communication restriction.
  • the part of the forward carrier may have no correspondence with the reverse carrier mapped in the above step 11.
  • a reverse carrier mapped to the terminal in step 11 corresponds to a unique forward carrier, the terminal does not need to perform step 12 and can directly camp on the forward carrier.
  • the method for implementing the carrier load balancing provided by the embodiment of the present invention is mapped to a reverse carrier by using a mapping algorithm in a part or all of the reverse carrier range, so that when a large number of M2M applications or intelligent terminals use the random access channel, Each terminal is mapped to a reverse carrier by using a mapping algorithm, which ensures that the number of terminals mapped by each reverse carrier is close to or even the same, so that the number of terminals that initiate random access on each reverse carrier is close to or even the same, that is, each random The load between the access channels is balanced.
  • step 12 may further include: the terminal camping on the forward carrier mapped in step 12 to obtain information sent by the network side.
  • the foregoing step 11 may further include: the terminal initiating access from the reverse carrier to which the step 11 is mapped to send information to the network side.
  • the terminal is mapped to one of all reverse carriers by using a mapping algorithm in an idle state or before an access is to be initiated, and a terminal that is connected to each reverse carrier is ensured in the case of a large number of terminals.
  • the number is balanced, and when the number of forward carriers and reverse carriers is not equal, the load balancing between the reverse carriers improves the performance of the reverse access channel, and the increasing amount of uplink information is larger than the downlink information.
  • the performance requirements for the reverse access channel is provided.
  • FIG. 2 is a flowchart of a method for implementing carrier load balancing on a network side corresponding to the embodiment shown in FIG. 1 according to an embodiment of the present invention. As shown in Figure 2, the operations on the network side include:
  • Step 21 The network side obtains one reverse carrier used by the terminal by using a mapping algorithm in a part or all of the reverse carrier range, where the obtained one reverse carrier corresponds to multiple forward carriers.
  • the network side uses a mapping algorithm (such as a modulo algorithm, a hash algorithm, etc.) to derive the reverse carrier that the terminal will use.
  • a mapping algorithm such as a modulo algorithm, a hash algorithm, etc.
  • Step 22 The network side obtains one of the part or all of the forward carriers used by the terminal by using a mapping algorithm in a part or all of the forward carrier range.
  • the mapping algorithm is used in all forward carriers corresponding to the reverse carrier to obtain a forward carrier that the terminal should use. Then, if the network side wants to send unicast information from the control channel to the terminal, it is sent from the forward carrier. If the reverse carrier calculated in step 21 corresponds to a unique forward carrier, the network side obtains the forward carrier that the terminal should use according to the correspondence, and then, if the network side sends the unicast information from the control channel to the terminal. When it is sent from the forward carrier.
  • the requirement of carrier load balancing in the above embodiment is satisfied from the network side.
  • FIG. 3 is a flowchart of a method for implementing carrier load balancing according to Embodiment 2 of the present invention.
  • the number of forward carriers of the terminal is smaller than the number of reverse carriers, and one forward carrier may correspond to multiple reverse carriers.
  • the method for implementing reverse carrier load balancing by the terminal includes: Step 31: The terminal maps to a forward carrier by using a mapping algorithm in part or all of the forward carrier range; wherein, the mapping is performed One forward carrier corresponds to multiple reverse carriers. Specifically, the terminal may be mapped to a certain forward carrier according to the prior art or using a mapping algorithm in all forward carrier ranges.
  • the terminal may be mapped to a certain forward carrier within the part of the forward carrier range according to the prior art or using a mapping algorithm in a part of the forward carrier range. If the operator wants to distinguish the communication between the M2M and the H2H on the forward carrier and/or the reverse carrier, that is, the communication of the M2M is limited to the partial forward carrier and/or the reverse carrier, so that in step 31, the idle The state terminal can use the mapping algorithm in the partial forward carrier range.
  • Step 32 The terminal maps to one of the part or all of the reverse carriers by a mapping algorithm in a part or all of the reverse carrier range.
  • the terminal uses a mapping algorithm on all reverse carriers corresponding to the forward carrier, and maps to one of the reverse carriers.
  • the terminal may also map within the entire reverse carrier range of the sector; or the terminal uses a mapping algorithm to map within a partial reverse carrier range of the sector, for example, within a partial reverse carrier range of the M2M communication restriction.
  • a mapping algorithm is used to map to a reverse carrier within the portion of the partial reverse carrier.
  • a forward carrier mapped to the terminal in step 31 corresponds to a unique reverse carrier
  • the terminal may not need to perform step 32.
  • the correspondence between the forward carrier and the reverse carrier can be obtained by a sector side device, such as a sector parameter message broadcast by the base station.
  • the foregoing step 32 may further include: the terminal initiating random access on the reverse carrier mapped to the foregoing step 32.
  • the technical solution provided by the embodiment provides a forward carrier load balancing by using a mapping algorithm in multiple reverse carriers corresponding to the forward carrier, so that the number of reverse carriers in the wireless communication system is greater than the number of forward carriers. Moreover, only partial mapping algorithm is needed to implement reverse carrier load balancing, which improves the processing efficiency of reverse carrier mapping.
  • the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.
  • FIG. 4 is a schematic diagram of a method for implementing carrier load balancing according to an embodiment of the present invention. Schematic diagram of the structure of the end.
  • the terminal includes: a reverse mapping unit 41 and a forward mapping unit 42.
  • the reverse mapping unit 41 is configured to map to a reverse carrier by using a mapping algorithm in a part or all of the reverse carrier range, where the reverse carrier corresponding to the mapping corresponds to multiple forward carriers.
  • Forward mapping unit 42 is configured to map to one of the partial or all forward carriers by a mapping algorithm over a portion or all of the forward carrier range.
  • the forward mapping unit 42 maps to one of the partial or all forward carriers by a mapping algorithm in a partial forward carrier range
  • the forward mapping unit 42 may be specifically used in the reverse direction.
  • the plurality of forward carriers corresponding to the carrier are mapped to one of the plurality of forward carriers by using a mapping algorithm. For details, refer to the description of step 12 in the embodiment shown in FIG. 1 .
  • the terminal provided in this embodiment uses a mapping algorithm to map the reverse carrier in a part or all of the reverse carrier range of the terminal by using a reverse mapping unit, so that the number of terminals mapped by each reverse carrier is close to or even the same, thereby making each inverse
  • the number of terminals that initiate random access to the carrier is close to or even the same, that is, the load between the random access channels reaches an equalization
  • the forward mapping unit maps to the part or part by a mapping algorithm in a part or all of the forward carrier range The equalization of the forward carrier load is ensured on one of the forward carriers.
  • FIG. 5 is a schematic structural diagram of a network side device that implements the foregoing method for implementing carrier load balancing according to an embodiment of the present invention.
  • the network side device includes: a reverse carrier acquiring unit 51 and a forward carrier acquiring unit 52.
  • the reverse carrier acquiring unit 51 is configured to obtain a reverse carrier used by the terminal by using a mapping algorithm in a part or all of the reverse carrier range, where the obtained one reverse carrier corresponds to multiple forward carriers.
  • the forward carrier acquisition unit 52 is configured to obtain one of the partial or all forward carriers used by the terminal by a mapping algorithm in part or all of the forward carrier range.
  • the forward carrier acquiring unit 52 may be specifically configured to use the corresponding carrier.
  • a forward carrier used by the terminal is obtained by using a mapping algorithm. For details, refer to the description of step 22 in the foregoing method embodiment shown in FIG. 2 .
  • the network side device provided by this embodiment may be a base station, and the reverse carrier acquisition unit uses a mapping algorithm to obtain a reverse carrier used by the terminal, and the network side satisfies the reverse carrier load of the foregoing embodiment. Balanced requirements.
  • FIG. 6 is a schematic structural diagram of another terminal for implementing the foregoing method for implementing carrier load balancing according to an embodiment of the present invention. As shown in FIG. 6, the terminal includes: a forward mapping unit 61 and a reverse mapping unit 62.
  • the forward mapping unit 61 is configured to map to a forward carrier by using a mapping algorithm in a part or all of the forward carrier range; where the forward carrier corresponding to the mapping corresponds to multiple reverse carriers; The description of step 31 in the above method shown in FIG.
  • the reverse mapping unit 62 is configured to map to one of the partial or all reverse carriers by a mapping algorithm over a portion or all of the reverse carrier range.
  • the reverse mapping unit 62 may be specifically configured for the forward carrier.
  • Corresponding multiple reverse carriers are mapped to one of the plurality of reverse carriers by a mapping algorithm. For details, refer to the description of step 32 in the method shown in Figure 3 above.
  • the terminal provided in this embodiment is mapped to one of the part or all of the forward carriers by using a mapping algorithm in a part or all of the forward carrier range by the forward mapping unit, thereby ensuring the balance of the forward carrier load.
  • the reverse mapping unit is used to map the reverse carrier in a part or all of the reverse carrier range of the terminal, so that the number of terminals mapped by each reverse carrier is close to or even the same, so that random attacks are initiated on each reverse carrier.
  • the number of terminals accessed is close to or even the same, that is, the load between the random access channels is balanced.
  • FIG. 7 is a schematic structural diagram of a wireless communication system according to an embodiment of the present invention.
  • the wireless communication system includes a network side device 71 and a terminal 72.
  • the terminal 72 can be any one of the foregoing methods and terminal embodiments, and can implement reverse carrier load balancing.
  • the network side device can also be the network side device shown in FIG. 5 above, and can implement reverse carrier load balancing in cooperation with the terminal 72.
  • the forward carrier and the reverse carrier in the foregoing embodiment may be all the pre-reverse carriers in the sector parameter message, or may be the pre-reverse carriers in the pre-reverse carrier that are not supported by the terminal. It is also possible to deduct the pre-reverse carrier that is not supported by the terminal in the reverse carrier and the derived pre-reverse carrier set after applying the access hashing (AccessHashingMask) feature.
  • the above embodiments can increase the mapping rule of the terminal mapping to a certain carrier, and the corresponding APersistence i] value of each reverse carrier can be added as a weight in the mapping algorithm.
  • the types of terminals in the above embodiments may be M2M terminal, terminal of a group of M2M, etc. In the above embodiment of the present invention, load balancing between the reverse carriers is improved in a scenario where the number of forward carriers is not equal to the number of reverse carriers.

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

Abstract

Les modes de réalisation de la présente invention concernent un procédé, un terminal, un dispositif et un système permettant de réaliser un équilibrage de charge de porteuse. Le procédé permettant de réaliser un équilibrage de charge de porteuse comprend : le mappage d'un terminal sur une porteuse de retour au moyen d'un algorithme de mappage dans le champ d'application d'une partie des, ou de toutes les, porteuses de retour, une porteuse de retour sur laquelle le terminal est mappé correspondant à une pluralité de porteuses d'aller ; et le mappage du terminal sur une porteuse d'aller dans une partie des, ou toutes les, porteuses d'aller au moyen d'un algorithme de mappage dans le champ d'application d'une partie des, ou de toutes les, porteuses d'aller. Pour cette raison, chaque terminal est mappé sur un transporteur de retour au moyen d'un algorithme de mappage lorsqu'un grand nombre d'applications machine-machine ou de terminaux intelligents utilisent le canal à accès aléatoire. Du fait de l'uniformité ou de la caractéristique de probabilité égale de l'algorithme de mappage, on garantit que les nombres de terminaux mappés sur diverses porteuses de retour sont similaires ou même identiques, de telle sorte que les nombres de terminaux initiant un accès aléatoire sur diverses porteuses de retour sont similaires ou même identiques autant que possible, c'est-à-dire les charges parmi les divers canaux à accès aléatoire sont équilibrées, réalisant l'équilibrage de charge parmi les diverses porteuses de retour.
PCT/CN2011/080729 2010-11-18 2011-10-13 Procédé, terminal, dispositif et système permettant de réaliser un équilibrage de charge de porteuse WO2012065487A1 (fr)

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CN201010556469.5 2010-11-18

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CN107852643A (zh) * 2015-07-29 2018-03-27 三星电子株式会社 空闲模式负载均衡

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