WO2010028608A1 - Transmission method, network device and terminal device for circuit switch field services - Google Patents

Transmission method, network device and terminal device for circuit switch field services Download PDF

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Publication number
WO2010028608A1
WO2010028608A1 PCT/CN2009/073912 CN2009073912W WO2010028608A1 WO 2010028608 A1 WO2010028608 A1 WO 2010028608A1 CN 2009073912 W CN2009073912 W CN 2009073912W WO 2010028608 A1 WO2010028608 A1 WO 2010028608A1
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Prior art keywords
service
switched domain
circuit switched
frame
scheduling
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PCT/CN2009/073912
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French (fr)
Chinese (zh)
Inventor
薛怀杰
刘明
周璐
张岩强
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华为技术有限公司
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Priority to CN2008101985876A priority Critical patent/CN101674604B/en
Priority to CN200810198587.6 priority
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Publication of WO2010028608A1 publication Critical patent/WO2010028608A1/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/54Store-and-forward switching systems
    • H04L12/56Packet switching systems

Abstract

A transmission method, network device and terminal device for circuit switch field services are provided. The method includes: a connection based on block scheduling is established for the circuit switch field services; the circuit switch field services are scheduled on the air interfaces in the block scheduling way, and the circuit switch field services are multiplexed according to the scheduling and then transmitted, or the services of the circuit switch field and the packet switch field are multiplexed and then transmitted. Using the technical schemes provided by the embodiments of the present invention, the circuit switch field services are multiplexed into the packet switch field, the utilization rate of the channel resources is increased, the network capacity and the network throughput are improved, and sharing the resources of the circuit switch field and the packet switch field is implemented.

Description

 Transmission method, network device and terminal device of circuit switching domain service The application is filed on September 12, 2008, and the application number is 200810198587.6, and the invention name is "a transmission method and network of circuit switching domain service". The priority of the Chinese patent application for the device and the terminal device is incorporated herein by reference. Technical field

 The present invention relates to the field of communications, and in particular, to a method, a network device, and a terminal device for transmitting a circuit switched domain service. Background technique

 The existing Global System For Mobile Communication (GSM) service is divided into two types: Circuit Switch (CS) and Packet Switch (PS); voice services are transmitted through the CS domain. of. The second layer (L2) of the CS domain in the network hierarchy adopts the Link Access Protocol on the Dm channel (LAPDm) and monopolizes the channel, and carries at most two voice services per time slot; The domain uses the Radio Link Control (RLC)/Media Access Control (Medie Access Control, MAC) protocol in L2.

 In the process of the present invention, the inventors have found that the background art has at least the following problems: The voice transmission in the existing GSM system is based on the CS domain, and the transmission of the voice frame uses the exclusive channel, resulting in waste of channel resources and network capacity. bottleneck. Summary of the invention

The technical problem to be solved by the present invention is to provide a transmission method, a network device, and a terminal device of a circuit switched domain service, which implements multiplexing of a CS domain service into a PS domain, and reduces waste of channel resources. To this end, in one aspect, an embodiment of the present invention provides a method for transmitting a circuit switched domain service, including: establishing a block scheduling based connection for a circuit switched domain service; and using the circuit switched domain service in a block scheduling manner in an air interface Performing time division multiplexing scheduling, performing time division multiplexing on the circuit switched domain service, transmitting on the connection, or time division multiplexing the circuit switched domain and the packet switched domain service, and transmitting on the connection.

 The embodiment of the present invention further provides another method for transmitting a circuit switched domain service, including: receiving a downlink service frame sent by a block scheduling based transport link; parsing and classifying the received downlink service frame, The service distinction includes: the distinction between circuit switched domains, or the distinction between circuit switched domain and packet switched domain services, or the distinction between packet switched domain services.

 In another aspect, an embodiment of the present invention provides a network device, including: an establishing unit, configured to establish a block scheduling-based connection for circuit switched domain services, so as to carry circuit switched domain services on a packet switched domain network; a unit, configured to perform time division multiplexing scheduling on the air interface in a block scheduling manner, and perform time division multiplexing on the circuit switched domain service to transmit or switch circuit switched domain services and packet switching on the connection The domain service is time-division multiplexed and transmitted on the connection.

 An embodiment of the present invention further provides a terminal device, including: a codec unit, configured to encode and decode a circuit switched domain service frame transmitted in a packet switched domain; and a distinguishing unit, configured to perform circuit switching on a downlink received service The domain and/or the packet switched domain service is differentiated, and the corresponding service content is obtained by decoding the codec unit; the sending unit is configured to send the encoded uplink state identifier carried by the circuit switched domain service frame obtained by the codec unit. Upstream service frame.

 The embodiment of the present invention further provides a terminal device, where the terminal device is used to implement another method for transmitting circuit switched domain services provided by the embodiments of the present invention.

In the solution provided by the embodiment of the present invention, resource sharing between the CS domain and the PS domain is implemented by multiplexing the CS domain service into the PS domain, which improves channel resource utilization and improves network capacity and throughput. DRAWINGS BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in the claims

 1 is a comparison diagram of a protocol stack of a CS domain service and a protocol stack of an existing CS domain service according to an embodiment of the present invention;

 2 is a flow chart of a first specific embodiment of a method for transmitting a circuit switched domain service according to the present invention; FIG. 3 is a flow chart of a second specific embodiment of a method for transmitting a circuit switched domain service according to the present invention; A flowchart of a third specific embodiment of a method for transmitting a circuit switched domain service in the invention; FIG. 5 is a schematic diagram of a USF encoding format in a TCH FS service frame according to the present invention;

 6 is a schematic structural diagram of a specific embodiment of a network device in the present invention;

 7 is a schematic diagram showing the composition of a specific embodiment of the scheduling unit in FIG. 6;

 Figure 8 is a schematic diagram showing the composition of a specific embodiment of the coding unit of Figure 7;

 9 is a schematic structural diagram of a specific embodiment of a terminal device in the present invention;

 Figure 10 is a block diagram showing the composition of a specific embodiment of the codec unit of Figure 9. detailed description

 The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings of the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

 The technical solutions provided by the embodiments of the present invention include the following: The transmission of service frames (such as voice frames or data frames) for performing CS domain services in the background technology is based on a CS domain network, and the transmission of service frames exclusively constitutes a communication channel (such as each The time slot maintains 1 or 2 voice calls), causing waste of channel resources and bottleneck of network capacity.

Therefore, in the embodiment of the present invention, a scheme for using a packet network to carry a CS domain service (for example, a voice service) is proposed, and a protocol stack of the original CS domain service is modified, that is, the L2/RL protocol is used in L2 to replace the original The LAPDm protocol is as shown in FIG. 1. The left side of the figure is a protocol layered structure based on the original CS domain for transmitting voice services, and the right side is the protocol for transmitting the CS domain service in the embodiment of the present invention. Hierarchical structure. The packet network used to carry the CS domain service, for example, may be a GSM EDGE Radio Acces s Network (GERAN), which allows users to be used in multiple time slots in the packet domain, and also allows each time slot. Reuse multiple users.

 In the technical solution provided by the embodiment of the present invention, by carrying the CS domain service in the packet network, the CS domain service can adopt a higher speech coding rate, and even a 16QAM (Quadrature Amplitude Modulation) can be introduced. And high-order modulation methods such as 32QAM, thereby achieving multiplexing and resource sharing between CS domain services, or between CS domain services and PS domain services.

 A flowchart of a first specific embodiment of a method for transmitting a circuit switched domain service according to the present invention is as shown in FIG. 2. The embodiment includes:

 Step 201: Establish a block scheduling-based connection for the CS domain service.

 The CS domain service may include a voice service, and may also include a data service. In general, the block scheduling process may include: when multiple users multiplex the same channel, or when a user multiplexes multiple channels, the allocation is performed, and the uplink is assigned by the uplink status identifier (UPL ink tarpel, USF). For each user's uplink block resource, the block scheduling-based connection may be a Temporary Block Flow (TBF) and a TBF-like connection. Specifically, for a CS domain service, an uplink/downlink TBF connection or a TBF-like connection is established on the air interface; thus, the network side can perform uplink and downlink on the CS domain service frame (or the RLC/MAC block formed after coding the CS domain service frame). Scheduling, that is, scheduling the air interface resources by means of dynamic block scheduling. The CS domain service is dynamically scheduled by using the air interface resource, so that one circuit switched domain service can be transmitted on multiple time slots, or multiple circuit switched domain services are multiplexed on the same time slot, or the circuit domain service and the packet domain service are the same. Multiplexed on the time slot.

Step 202: Perform time division multiplexing scheduling on the air interface in a block scheduling manner, perform time division multiplexing on the circuit switched domain service, and transmit or switch the circuit switched domain service and the packet switched domain on the connection. The service is transmitted over the connection after time division multiplexing. The air interface refers to the air interface of the packet switched domain, and the existing circuit switched domain service cannot be multiplexed when performing service transmission, that is, the existing circuit switched domain service does not have time division multiplexing scheduling. of mouth.

 When multiplexing CS domain services, multiple services need to be multiplexed on the same channel or on several channels. For example, three services are transmitted through two channels, and each service is not exclusively used. Channel, therefore, it is necessary to schedule transmission of multiple services on multiple channels, so as to implement efficient transmission of multiple services on multiple channels after time division multiplexing.

 When scheduling in the air interface of the PS domain, the scheduling policy is followed:

 In the uplink and downlink scheduling, when the CS and PS domain services are multiplexed, the CS domain services are preferentially multiplexed and transmitted, that is, multiple CS domain services are time-division multiplexed and transmitted.

 Because the CS domain service is to be carried in the PS domain network, the CS domain service needs to be encoded differently from the original CS domain service. The multiplexing scheduling method is also different according to the specific coding mode. Describe the specific situation separately.

 According to the first embodiment of the present invention, as shown in FIG. 3, in the case of performing RLC encoding and multiplexing on the CS domain service, the method includes:

 Step 301: Establish a block scheduling-based connection for the CS domain service.

 Step 302: Perform RLC encoding on the CS domain service, where the CS domain service after the RLC encoding includes the USF domain and the Temporary Flow Identity (TFI) domain.

 This step may specifically include:

 The existing speech coding rate is mapped to the RLC coding mode, and the service bits (ie, CS domain service content) carried by the CS domain are encoded (such as error correction coding) by using the remaining bits in the RLC block to improve link performance.

 Or, the service frame is first cached and then RLC coded.

 In a scenario where the wireless environment is good and the degree of reusability is high, the high-rate RLC coding can further improve the system capacity under the premise of ensuring certain voice quality and delay performance.

Since the length of the transmitted CS frame is usually much smaller than the transmitted PS block, in order to improve the utilization, multiple CS frames can be packed and then encoded and transmitted. The following describes the process of RLC encoding and packing of CS domain service frames in detail: The process of performing RLC/MAC encoding on a CS domain service frame, including:

 The RLC coding of the CS domain service frame may not modify the RLC/MAC header format. For voice services carried on the PS network, a non-persistent acknowledgment mode (ie, retransmission only) can be used. In this process, Fast Ack/Nack Reporting (FANR) technology can also be used to reduce the delay caused by retransmission.

 Currently, the rate of the GSM full-rate (FR) voice service is 13 kbit/s, and the rate of the half-rate (HR) voice service is 5.6 bits/s. The enhanced full-rate (EFR) voice service is provided. The rate is 12.2kbit/s, and the Adaptive Multi-Rate Code (AMR) Narrow Band (NB) rate is 4.75 - 12.2kbit/s, while the AMR Broadband (Wide Band, WB) The rate is 6.60-23.85 kbi t/s. It can be seen that the CS speech coding rate and the RLC coding rate in the prior art are inconsistent. If the PS network is used to directly carry the service frame, the bandwidth resource is wasted and the performance is degraded.

 Therefore, in order to make full use of the bandwidth and improve the link performance of the RLC bearer service frame, the embodiment of the present invention performs error correction coding on the bearer service frame by using the remaining bits of the RLC block, such as a Cyclic Redundancy Check (CRC). ).

 For error correction coding, GSM FR is used as an example. The GSM FR rate is 13kbit/s. CS-2 (rate 13.4kbit/s) or MCS-3 (14.8kbit/s) can be used to carry FR services. frame. Taking MCS-3 as an example, after adding a service frame, the number of remaining bits is 36, and the 36 bits can be used to perform error correction coding on the carried service frame, so as to improve link performance, as shown in Table 1: Table 1 : RLC Block Structure (MCS-3) carrying FR Service Frames

 RLC/MAC block (RLC/MAC block)

 RLC/MAC header RLC data block (RCC data block) CRC

 ( RLC/MAC header) (Voice Frame)

 4 octets (bytes) 32.5 octets 4.5 octets

Compared with the full-rate voice service, in the half-rate voice service, the service frame of two users is included every 20 ms (that is, two bursts per service frame), and the RLC is performed on the HR service frame. When encoding, only the service frame of the same user can be carried in every 20 ms data block. Therefore, for the RLC encoding of the HR service frame, the two HR users that are downlink multiplexed are scheduled to be scheduled every 20 ms. For a certain HR user, the HR service frame of the first 20 ms needs to be buffered, and then the two service frames are cascaded. Hosted in the same RLC block. This will cause a 20ms delay.

 For example, the GSM HR rate is 5.6 kbit/s, and the MCS-2 can be selected to carry half-rate voice services. The RLC coding rate of the MCS-2 is 11.2 kbit/s, which can be used to carry two HR service frames (as shown in the figure below). The cascade of two GSM HR service frames is directly connected end to end.

 Table 2: RLC Block Structure for Carrying HR Traffic Frames (MCS-2)

 4 octets (bytes) 14 octets 14 octets

 A similar approach can be used for RLC coding of AMR modes. Since the bandwidth of the PS domain is high, the service frame of the CS domain (ie, the voice frame) is transmitted in the PS domain, which can improve the A-voice coding transmission rate.

 If the CS domain service to be multiplexed in the embodiment of the present invention adopts a non-acknowledgment mode, some domains in the RLC header, such as a Block Sequence Number (BSN), may be used to carry the transmitted link. Information to further improve the link performance of the technical solution.

 The following describes how to package the CS domain service frame and carry it in the RLC/MAC block. The high throughput of the PS domain is a big advantage, especially after the evolution of GERAN. In the core of the CS/PS domain service to be multiplexed in the embodiment of the present invention, we can use the high rate of the PS domain to carry more service frames in each RLC/MAC block, so that In a scenario with good radio environment and high reusability, high-rate RLC encoding is used to further improve system capacity and spectrum efficiency while ensuring certain voice quality and delay performance.

Taking the Full Rate Speech Traffic Channel (TCH FS ) as an example, MCS-3 can be used to carry a single CS domain service frame. If the channel quality of the current scene is 4, However, if the multiplexing degree is high, MCS-6 coding can be used to carry two consecutive CS domain service frames (as shown in the following figure). This frees up half of the time and resources, and the time and resources saved can be used to access more CS or PS users. As shown in Table 3, the packet to be transmitted after the RLC encoding is performed after being packaged.

 Table 3: Block format after TCH FS service frame packing (MCS-6)

RLC/MAC block (RLC/MAC block)

 Rlc data block ( RLC data block)

 RLC/MAC header

 Voice Frame 1 Voice Frame 2 CRC

 ( RLC/MAC header)

 (Voice Frame 1) (Voice Frame 2)

 4 octets 32.5 octets 32.5 octets 9 octets

 Step 303: The PS domain service and the RLC-encoded CS domain service are scheduled in a block scheduling manner according to the scheduling policy, and the CS domain service or the CS domain service and the PS domain are performed according to the scheduling. Between services, or multiplexing and transmission between PS domain service domains. The scheduling usually includes downlink scheduling (the direction of the network side to the user side is called downlink) and uplink scheduling (the direction of the user side to the network side is called uplink). The scheduling strategies of the two schedules are respectively described below.

 First, downlink scheduling

 The CS user service is transmitted on the established block-based connection. For example, when the CS user service adopts the Discontinuous Transmission (DTX) mechanism, only 40% of the time is transmitted for a CS domain service. Therefore, there is idle time in the transmission process. Therefore, multiple CS domain services can be used, or the CS domain service and the PS domain service can be multiplexed. The following two cases are taken as an example to describe the specific multiplexing scheduling process.

 1), CS and PS multiplexing scheduling

 When the CS and PS domain services are multiplexed, the scheduling uses the principle of absolute priority of the CS domain service. When the CS user does not need voice data to be transmitted, the PS downlink data block is multiplexed and transmitted.

 2), multiplexing scheduling between CS

If the network side does not support multiplexing between CS users in the same time slot, that is, communication between CS domain services is not supported. The multiplexing does not require scheduling between CS users. If the network side supports multiplexing between CS users in the same time slot, the CS domain service can be reused for multiple channels according to the principle of statistical multiplexing (for example, CS users are multiplexed on two time slots, and three users simultaneously The probability of a call is 6.4%, and 4 of the 4 users who have a call at the same time have a rate of 17.92%, and the channels with a small call rate can be reused. Reuse. When the degree of multiplexing on the channel group is high, if there is a conflict in the downlink scheduling of the CS domain service frame, it can be solved by using a cache.

 If the CS-domain service is a half-rate service (HR), because in the half-rate service, the scheduling (such as MAC scheduling) is once every 20ms, the service frames of the two CS domain services need to be scheduled within 20ms, that is, each service frame occupies two A burst (burst), in the downlink, try to schedule the two multiplexed HR services together in a 20ms period. When only one HR service is multiplexed in the channel group, or no other HR service has data for transmission within the current 20 ms, the other two bursts may transmit a Silence Descriptor (SID) frame (the SID frame may be the HR service) Or other HR business).

 Second, the uplink scheduling.

 When the RLC is encoded, the USF is already encoded in the service frame. Therefore, when performing uplink scheduling, scheduling can be performed according to the existing USF.

 The specific scheduling method is as follows:

 Setting the USF in the service frame of the CS domain service that is sent to the user, where the USF is used to indicate the user who can upload the service frame in the next uplink block;

When the full-rate CS user side listens to its own USF, it can send service frames or SID frames on the uplink. Before receiving the SID frame of the user, the network side needs to schedule the uplink service for the user. When the network receives the SID frame of the user, it indicates that the user enters the voice quiet period, and only needs to periodically schedule the user's uplink. For example, once every 480 ms, the scheduled resources are used to transmit the SID or service frame of the user; other idle resources can be allocated to other users, such as allocating idle uplink resources to the multiplexed CS or PS users; If the network side receives the normal service frame of the user on the uplink, it indicates that the user returns to the normal call state, and then the user needs to be scheduled at the moment. Row.

 When a half-rate CS user listens to its own USF, the next upstream block resource belongs to the user. This requires the user side to cache the previous service frame (each service frame is carried on 2 bur st), and the current The traffic frames are sent together in the next upstream block cycle. That is, the upstream block resource is scheduled to be rotated between two half rate users. When both half-rate users are in the silent period, the multiplexed CS and PS users can be scheduled, similar to the full rate, to allocate idle resources to the multiplexed CS or PS users.

 Corresponding to the case of RLC-based post-coding multiplexing shown in FIG. 3, as shown in FIG. 4, in order to perform the codec transmission after the CS domain service is different from the existing CS domain service, the corresponding process includes :

 401. Establish a block scheduling-based connection for the CS domain service.

 402. The network side performs new channel coding on the CS domain service, that is, encodes physical layer transmission data of the service frame format in the CS domain service. The RLC coding may not be performed here. However, since the CS domain service is carried in the PS domain network, the coding mode of the original CS domain service needs to be modified. For example, insert USF in the service frame format of the CS domain service, or insert USF and TFI.

 403. Perform scheduling in a block scheduling manner on the wireless air interface of the PS domain in the PS domain according to the scheduling policy, and perform CS domain services between the CS domain services and the PS domain services according to the scheduling, or It is a multiplexed transmission between PS domain service domains. The scheduling in this step is similar to the embodiment shown in FIG. 3, and includes the uplink scheduling and the downlink scheduling, where the downlink scheduling is consistent with the description in the embodiment shown in FIG. 3, and details are not described herein. Only the uplink scheduling is described below:

 Scheduling for upstream users (including CS users and PS users) requires a scheduling flag, such as USF. The USF scheduling method in the prior art is still used in the PS domain. In the CS domain, the USF domain needs to be added to the service frame structure in the existing technology, that is, the USF domain is inserted in the service frame.

In the Gaussian Minimum Shifting Keying (GMSK) modulation mode, the 3-bit USF is encoded to form 12 bits, so it is required in the service frame after encoding based on the prior art. 12-bit space to insert USF in order to obtain the present invention A new channel coded service frame is performed in the embodiment. The method of inserting the USF may include any one of the following:

 First, the USF can be inserted into the idle bits before encoding (for example, 1 3k full rate, 8 bits idle after channel coding).

 Second, the data after the convolutional code (which is an error correction coding technique of a physical layer) can be punctured to obtain a space of 12 bits. The USF encoding format in the TCH FS service frame is shown in Figure 5.

 In addition, the USF only needs to interleave (interlace refers to the process of reordering the signal) to the current 4 bursts (bur s t ), and the position of the interlace needs to enable the PS user side to correctly decode. Therefore, whether it is a PS data block or a CS domain service frame, the interleaving method of the USF on the four bur s t is the same. Therefore, the CS user side only needs to deinterleave according to the CS domain, and then read the USF from the corresponding location (so that the USF may be interspersed in the two service frames). The USF code of the half-rate voice service is similar to the full rate. In this case, the USF needs to be mapped to the service frames of the two half-rate users.

 For the service frame inserted in the USF, the specific scheduling mode of the uplink scheduling is the same as that described in the embodiment of FIG. 3, and is not mentioned here.

 The method for transmitting the circuit switched domain service in the embodiment of the present invention may further include the step of the user side distinguishing the received service, that is, the user side distinguishes the obtained CS domain service in the PS domain. , get CS or PS domain business content.

 When the network side performs service transmission, the CS or / and PS domain services are multiplexed. Therefore, the user side needs the user terminal to distinguish the two services to obtain specific service content. According to the different objects to be distinguished, the above specific methods are described as follows:

 1) Differentiate between different PS domain services.

 When CS and PS users are multiplexed and multiplexed, the distinction between PS users is the same as in the prior art, that is, since the PS domain services are all coded and decoded by RLC, they are still in the RLC/MAC header in the RLC coding. TF I to indicate different PS domain services.

2) Differentiate the CS domain service from the PS domain service. The CS domain services that are not transmitted by RLC codec are distinguished as follows:

 When the user side of the PS domain service receives the CS domain service frame, the check fails when the header is decoded. Therefore, when the header is decoded, the check fails. The arrival is for the CS domain service, otherwise it is the PS domain service. This approach is compatible with existing terminal side support for PS domain services.

 When a CS user performs a CS domain service and a PS domain service distinction, it can distinguish by stealing frame bits in the service content. After encoding and pulse formatting each service frame or data block on the network side, there are 8 stealing frame bits (ie, 2 burst frames per burst), as in the prior art, CS-1 (Code) Scheme-1 coding mode-1, ie, an RLC (L2) coding method for GPRS) is all l, CS-2 is (11001000), CS-3 is (00100001), CS-4 and MCS-1-4 are ( 00010110 ), the TCH frame stealing bit is all 0, and the Fast Associated Control Channel (FACCH) steals the frame bit to all ones. Therefore, in the embodiment of the present invention, the frame stealing bit of the FACCH is modified to be other bits, such as 01010101, so that the CS and PS domain services can be distinguished by stealing frame bits. This is because the stealing frame bits of the PS domain service are CS-1 -CS-4, MCS-1 -MCS-4 stealing frame bits; the TCH and FACCH stealing frame bits are CS stealing frame bits; however, CS- 1 and FACCH have the same frame stealing bits, so after modifying one of them, the CS user and the PS user can be completely distinguished; however, in order not to affect the existing PS terminal, it is necessary to modify the frame stealing bit of the FACCH.

 The CS domain services that are transmitted through the RLC codec can be distinguished according to the TFI domain added to the voice service.

 3) Differentiate between different CS domain services.

 The CS domain services that are not transmitted by RLC codec are distinguished as follows:

 If the user side does not support CS users for the same time slot, there is no need to distinguish between CS users; otherwise, it is necessary to implement the distinction between CS users. There are several ways to distinguish CS users, such as the following:

a. Stealing frame bits, for example, a series of stealing frame bit sequences (8 bits) can be defined to distinguish different CS users. b. The training sequence, for example, can define a series of mutually orthogonal training sequences to distinguish different CS users.

 c. TFI, for example, adds a TFI field to a service frame to distinguish different CS users.

 Wherein, since it is possible to perform CRC check bit on the data of the CS domain service, the TFI field may be XORed with the 5-bit CRC check bit to implicitly carry the TFI to the receiving end. Some voice channel codes have some idle bits (such as 13-bit full-rate services with 4 bits of idle bits) and can also be used to carry TFI.

 However, when full-rate and half-rate voice services are multiplexed in the same time slot, the method of carrying TFI cannot be distinguished. At this time, a training sequence or a frame stealing bit sequence can also be used to distinguish between full rate and half rate voice services.

 The CS domain services that are transmitted through the RLC codec can be distinguished according to the TFI domain added to the voice service.

 In addition, in the solution provided by the embodiment of the present invention, the encryption of the service frame only needs to be performed at the RLC/MAC layer. The key delivered by the core network is still used, so it does not affect the normal process of the core network. I will not go into details here.

 According to the foregoing description of the embodiments of the present invention, the use of the multiplexed CS/PS domain service improves the utilization of channel resources. For example, when GERAN is used to carry CS domain services, 8 times per time slot can be carried. Voice business. At the same time, the multiplexing of circuit and packet services can enable the network to carry more PS domain services or allocate more available channels for PS domain services, thereby improving the overall network capacity and throughput; the circuit and the packet domain are the same. The Um port L2 protocol simplifies the network structure and saves the network construction cost; and realizes the resource sharing of the circuit and the packet domain, which can more rationally allocate and make full use of the limited channel resources; In addition, utilize the advanced technology of GERAN (such as running Run-Time Type Ident I IF (RTTI) can improve the performance of circuit services.

Correspondingly, as shown in FIG. 6, the embodiment of the present invention further provides a network device 2, where the network device 2 includes: The establishing unit 20 is configured to establish a block scheduling-based connection for the CS domain service, so as to carry the CS domain service on the PS domain network.

 The scheduling unit 22 is configured to schedule the CS domain service in an air interface in a block scheduling manner, and perform CS or/and PS multiplexing service transmission according to the scheduling.

 As shown in FIG. 7, the scheduling unit 22 may further include:

 The encoding module 222 is configured to encode the CS domain service.

 The scheduling module 224 is configured to perform scheduling on the air interface in the block scheduling manner for the PS domain service and the encoded CS domain service according to the scheduling policy, and perform CS or / and PS multiplexing service transmission according to the scheduling. The scheduling policy includes: when the CS and the PS domain services are multiplexed in the uplink and downlink scheduling, the CS domain services are preferentially scheduled for multiplexing and transmission.

 The scheduling module 224 may further include: a setting sub-module 2240, configured to set a USF in a service frame of a CS domain service sent to the user, where the USF is used to indicate a user who is allowed to upload a service frame in the next uplink block, where the CS domain is used. The user of the service learns that the user can upload the service frame in the next uplink block according to the received USF in the service frame, and the user sends the service frame or the S ID frame in the next uplink block. The uplink scheduling sub-module 2242 is configured to receive the The service frame or the S ID frame sent by the user performs uplink scheduling. After receiving the S ID frame, the user enters the voice silent period, periodically schedules the uplink transmission S ID frame or service frame of the user, and idles the uplink resource. When the CS or PS user is assigned to the multiplex, when the service frame is received, it indicates that the user is restored to the normal call state. In this case, the uplink transmission service frame of the user needs to be scheduled at all times.

 As shown in FIG. 8, the encoding module 222 may include any one or two of the first encoding sub-module 2220 and the second encoding sub-module 2224, and the example in FIG. 8 is the case where both are included. The first coding sub-module 2220 is configured to perform RLC coding on the CS domain service, where the CS domain service after the RLC coding includes the USF domain and the TFI domain.

 The second coding sub-module 2224 is configured to perform new channel coding on the CS domain service, insert USF in a service frame format of the CS domain service, or insert USF and TFI.

As shown in FIG. 9, it is a terminal device 4 in the corresponding embodiment of the present invention, which includes: The codec unit 40 is configured to encode and decode the CS domain service transmitted in the PS domain. The distinguishing unit 42 is configured to perform CS domain and/or PS domain service differentiation on the downlink received service, and obtain corresponding service content by decoding by the codec unit 40. The manner and strategy for the specific differentiation are the same as those of other embodiments in the present invention, and are not mentioned here.

 The sending unit 44 is configured to correctly decode the obtained uplink scheduling identifier, and send the encoded uplink service according to the uplink scheduling identifier.

 As shown in FIG. 10, the codec unit 40 may include:

 The first codec module 400 is configured to perform a new channel coding and decoding on the CS domain service frame, that is, insert a USF in a frame format, or insert a USF and a TFI;

 Or, the second codec module 402 is configured to perform RLC encoding and decoding on the service frame in the CS domain service, where the CS domain service after the RLC coding includes the USF domain and the TFI domain.

 The nouns and related performing actions mentioned in the above systems and devices are consistent with those described in other embodiments of the present invention, and are not referred to herein.

 The embodiment of the present invention further provides a terminal device, which is used to implement the technical solution related to the terminal in the method embodiment of the present invention.

 Since the multiplexed CS and/or PS domain services are used in the embodiment of the present invention, the utilization of the channel resources is improved. For example, when the CSRAN is used to carry the CS domain service, eight voice services can be carried in each time slot. At the same time, the multiplexing of circuit and packet services can enable the network to carry more PS domain services or allocate more available channels for PS domain services, thereby improving overall network capacity and throughput; circuit domain and packet domain adoption The same Um port L2 protocol simplifies the network structure and saves the cost of network construction. It also realizes the resource sharing between the circuit domain and the packet domain, which can more rationally allocate and make full use of limited channel resources. At the same time, it utilizes advanced technologies of GERAN (such as RTTI) can improve the performance of circuit business.

The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, ie may be located One place, or it can be distributed to multiple networks On the unit. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment. Those of ordinary skill in the art can understand and implement without deliberate labor.

 Through the description of the above embodiments, those skilled in the art can clearly understand that the embodiments can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware. Based on such understanding, the above technical solutions may be embodied in the form of software products in essence or in the form of software products, which may be stored in a computer readable storage medium such as ROM/RAM, magnetic Discs, optical discs, etc., include instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments or portions of the embodiments.

 The above-described embodiments do not constitute a limitation on the scope of protection of the technical solutions. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the above-described embodiments are intended to be included within the scope of the technical solutions.

Claims

Claim
 A method for transmitting a circuit switched domain service, the method comprising: establishing a block scheduling based connection for a circuit switched domain service;
 Performing time division multiplexing on the air interface in the block scheduling manner in the circuit switching domain service;
 The circuit switched domain service is transmitted on the block scheduling based connection after time division multiplexing on the air interface.
 The method according to claim 1, wherein the performing the time division multiplexing of the circuit switched domain service in an air interface in a block scheduling manner comprises:
 When the circuit switched domain service and the packet switched domain service are time-multiplexed in an air interface in a block scheduling manner, the circuit switched domain service is preferentially time-division multiplexed on the air interface; or
 When only the circuit switched domain service is transmitted, the circuit switched domain service and the other one or more circuit switched domain services are time division multiplexed in the air interface in a block scheduling manner.
 The method according to any one of claims 1-2, wherein the circuit switching domain service performs time division multiplexing on the air interface in a block scheduling manner, including:
 Carrying a service frame in the circuit switched domain service in a radio link control block, and performing error correction coding on the carried service frame by using remaining bits of the radio link control block; or
 Two or more of the service frames in the circuit switched domain service are carried in a wireless link control block.
 The method according to any one of claims 1-2, wherein the circuit switching domain service performs time division multiplexing on the air interface in a block scheduling manner, including:
 Setting an uplink status identifier in the service frame of the circuit switched domain service, or setting an uplink status identifier and a temporary flow identifier, where the uplink status identifier indicates that the user of the circuit switched domain service is allowed to upload a service frame in the next uplink data block. Or silently indicate the user of the frame.
5. The method of any of claims 1-4, wherein the method further comprises: receiving a silent indication frame from a user of the circuit switched domain service, The method for performing time division multiplexing on the air interface in the block scheduling manner includes: periodically scheduling the uplink transmission silence indication frame or the service frame of the user, and allocating the idle uplink resource to other circuit switching domains. Business user or packet switched domain business user; or,
 The method further includes:
 Receiving a service frame from a user of the circuit switched domain service,
 And the method for performing time division multiplexing on the air interface in the block scheduling manner, and the method includes: scheduling, in real time, a service frame of the uplink transmission of the user.
 6. The method of any of claims 1-4, wherein the block scheduling based connection is a temporary data block stream.
 A method for transmitting a circuit switched domain service, the method comprising: receiving a downlink service frame sent by a transmission link based on a block scheduling;
 Parsing and classifying the received downlink service frame, where the service differentiation includes: a distinction between circuit switched domains, or a distinction between a circuit switched domain and a packet switched domain service, or a distinction between packet switched domain services .
 The method according to claim 7, wherein the performing service differentiation on the received downlink service frame includes:
 If the user of the packet switched domain performs a header decoding on the received downlink service frame, the check fails, and the received service is determined to be a circuit switched user service; or
 The user of the circuit switched domain distinguishes between the circuit switched domain service and the packet switched domain service according to the received sneak frame bit in the burst of the downlink service frame; or
 The user of the circuit switched domain distinguishes between different circuit switched domain services using pre-set stolen frame bits or training sequences, or with temporary flow identifiers set in circuit switched domain traffic frames.
 The method according to claim 7, wherein the downlink service frame includes an uplink status identifier;
Obtaining, by the parsing the received downlink service frame, the uplink status identifier included in the downlink service frame, where the method further includes: And transmitting the encoded uplink service frame according to the uplink status identifier.
 A network device, the device comprising:
 Establishing a unit for establishing a block scheduling based connection for the circuit switched domain service;
 a scheduling unit, configured to perform time division multiplexing on the air interface in a block scheduling manner, and perform time division multiplexing on the circuit switched domain service on the block scheduling connection, or The circuit switched domain service and the packet switched domain service are time division multiplexed on the air interface, and the multiplexed circuit switched domain service is transmitted on the block scheduling based connection.
 The network device according to claim 10, wherein the scheduling unit comprises: an encoding module, configured to encode the circuit switched domain service;
 a scheduling module, configured to perform time division multiplexing multiplexing on the air interface in the block scheduling manner according to the scheduling policy, where the scheduling policy includes: when the circuit switched domain service and the packet switching When domain services are multiplexed, the circuit switched domain services are preferentially scheduled for multiplexing.
 The network device according to claim 11, wherein the scheduling module comprises: a setting submodule, configured to set an uplink state identifier in a service frame of a circuit switched domain service sent to a user, where the uplink state is The identifier is used to indicate that the user is allowed to upload the service frame in the next uplink block, and the uplink scheduling sub-module is configured to periodically schedule the uplink transmission silence indication frame or the service frame of the user according to the received silence indication frame from the user. And allocating idle uplink resources to other circuit switched domain users or packet switched domain users; or for scheduling the uplink transmitted service frames of the user in real time according to the received service frames from the user.
 The network device according to any one of claims 11 to 12, wherein the coding module comprises: a first coding submodule, configured to perform radio link control coding on the circuit switched domain service; and / Or,
 And a second coding submodule, configured to insert an uplink status indicator in the service frame of the circuit switched domain service, or insert the uplink status indicator i and the temporary flow label i only.
A terminal device, the device comprising: a coding and decoding unit, configured to encode and decode a circuit switched domain service frame transmitted in a packet switched domain, and a distinguishing unit, configured to perform circuit switched domain and/or packet switched domain service differentiation on the downlink received service, and pass the codec unit Decoding to obtain the corresponding business content;
 And a sending unit, configured to send the encoded uplink service frame according to the uplink status identifier carried by the circuit switched domain service frame obtained by the codec unit.
 The terminal device according to claim 14, wherein the codec unit comprises: a first codec module, configured to perform channel coding and decoding on the circuit switched service frame, where the signal coding includes a pair of circuits The service frame of the switched domain service is coded by the circuit switched domain; and/or,
 And a second codec module, configured to perform radio link control codec on the service frame in the circuit switched domain service.
 A terminal device, characterized in that the terminal device is for implementing the method according to any one of claims 7-9.
PCT/CN2009/073912 2008-09-12 2009-09-14 Transmission method, network device and terminal device for circuit switch field services WO2010028608A1 (en)

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