WO2005053338A1 - Method and apparatus for enhancing relaying performance of mobile communication systems - Google Patents

Method and apparatus for enhancing relaying performance of mobile communication systems Download PDF

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Publication number
WO2005053338A1
WO2005053338A1 PCT/IB2004/052521 IB2004052521W WO2005053338A1 WO 2005053338 A1 WO2005053338 A1 WO 2005053338A1 IB 2004052521 W IB2004052521 W IB 2004052521W WO 2005053338 A1 WO2005053338 A1 WO 2005053338A1
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WIPO (PCT)
Prior art keywords
direct link
data
data stream
several
relayer
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PCT/IB2004/052521
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French (fr)
Inventor
Qunli Jia
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Koninklijke Philips Electronics N.V.
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Publication of WO2005053338A1 publication Critical patent/WO2005053338A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/12—Avoiding congestion; Recovering from congestion
    • H04L47/125—Avoiding congestion; Recovering from congestion by balancing the load, e.g. traffic engineering
    • 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
    • H04W28/0215—Traffic management, e.g. flow control or congestion control based on user or device properties, e.g. MTC-capable devices
    • 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
    • H04W28/0231—Traffic management, e.g. flow control or congestion control based on communication conditions
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user

Definitions

  • the present invention relates generally to a communication method and apparatus, and more particularly, to a method for enhancing relaying performance of mobile communication systems.
  • the UE can't communicate with the base station when falling into a region that is not covered by a cell. Moreover, because there are a lot of complex buildings in metropolitan areas, dead spots are thus formed in some regions that are even covered by some cells. In a dead spot, the UE can't receive signals from the base station, and can't send signals to the base station either.
  • An enhanced technique, named multihop is introduced for conventional communication systems to overcome these shortcomings, so that a UE can communicate with the base station even if it falls out of the cell's coverage range or in a dead spot.
  • multihop is a relaying technique used in peer to peer (P2P) networks, for a UE to communicate with a remote UE through relaying of other UEs.
  • P2P peer to peer
  • a UE When a UE is in a dead spot or falls out of the cell's coverage range, it still can communicate with the base station through relaying of other UEs, by introducing multihop technique in conventional mobile communication systems.
  • Fig.1 illustrates a conventional relaying communication in TD-SCDMA communication system. As it shows, UEO is far away from base station 10 and thus can't communicate with the base station directly, so it has to send signals to base station 10 through n forwardings of UE1 ... UEn.
  • Base station 10 As it shows, UEO is far away from base station 10 and thus can't communicate with the base station directly, so it has to send signals to base station 10 through n forwardings of UE1 ... UEn.
  • Base station 10 Base station
  • the UE sending the relayed signals and the UE/base station receiving the relayed signals can communicate through a direct connection.
  • the direct connection between the UE sending the relayed signals and the UE/base station receiving the relayed signals is called as a link below.
  • Direct connection L0, L1 ... Ln-1 and Ln in Fig.1 are all called as link.
  • each link connected with it is called as a direct link.
  • the source UE can send signals to each relayer through each direct link, and then each relayer can forward the signals to the next relayer or the base station.
  • UE1 when the source UEO sends signals through direct link L0, UE1 as the first-order relayer forwards the signals to the next-order UE, and the next-order UE forwards the signals again.
  • UEn sends the signals to base station 10 via Ln.
  • a UE can communicate with the base station through relaying of other relayers, by introducing multihop technique in conventional mobile communication systems. But the processing capability of a relayer is generally not so strong as that of the base station, so relayers can't process high-rate data streams as the base station. Therefore, the source UE can't expect to send high-rate data streams to the base station in this relaying way over links constructed by relayers.
  • the signals reaching the base station after n-order forwardings are generally very weak and can't meet the QoS requirement, because the signal processing capability of the relayer is not so strong as that of the base station.
  • An object of the present invention is to provide a method and apparatus for enhancing relaying performance of mobile communication systems.
  • the high-rate data stream from the source UE can be divided into several low-rate data stream and then forwarded to the base station through relayers without high-rate data processing capability.
  • Another object of the present invention is to provide a method and apparatus for enhancing relaying performance of mobile communication systems. With this method and apparatus, a strengthened signal can be obtained through diversity technique at the base station after a low-rate data stream from the source UE is forwarded over several links.
  • a method for enhancing relaying performance of mobile communication systems in the present invention, to be performed by a user equipment comprising steps of: detecting direct links of the user equipment; selecting several available direct links from the direct links according to the detection result; detecting the data processing capability of the relayer of each selected direct link; transmitting the data stream to be sent over the selected direct links, if the data processing capability of each relayer can satisfy the requirement for forwarding data; if the data processing capability of each relayer can't meet the requirement for forwarding data, dividing the data stream to be sent into several data streams capable of being processed by each selected direct link according to the status of each selected direct link, and transmitting the divided data streams over each corresponding selected direct link.
  • a method for enhancing relaying performance of mobile communication systems, to be performed by a network system, comprising steps of: receiving data streams transferred over several links; detecting the received data streams; combining the data streams to get the signal-strengthened data stream if the detection result indicates that the data streams are copies of the undivided data stream from the same source user equipment, and transmitting the combined data stream to the destination user equipment; combining the sub data streams to restore the original undivided data stream if the detection result indicates that the data steams are the divided sub data streams, and transmitting the restored data stream to the destination user equipment.
  • Fig.1 is a schematic diagram illustrating the relaying communication in existing TD-SCDMA communication system
  • Fig.2 is a schematic diagram illustrating the relaying communication in TD-SCDMA system in accordance with the present invention
  • Fig.3 is a flow chart illustrating the method for enhancing relaying performance of mobile communication systems to be performed by a UE in accordance with the present invention
  • Fig. 4 is a flow chart illustrating the method for enhancing relaying performance of mobile communication systems to be performed by the base station in accordance with the present invention
  • Fig.5 is a block diagram illustrating the structure of the apparatus for enhancing relaying performance of mobile communication systems in accordance with an embodiment of the present invention.
  • the main idea of the present invention can be summarized as: when a source UE can't communicate with the base station directly, it will detect whether the data processing capability of the relayer in each direct link can meet the requirement for forwarding data, that is, whether the data stream processing rate of the relayer in each direct link is higher than the data stream transmission rate of the source UE. If the data stream processing rate of the relayer in each direct link is lower than the data stream transmission rate of the source UE, the source UE divides the data stream to be transmitted into several sub data streams capable of being processed by the relayers, and then the sub data streams are forwarded through each relayer to the base station.
  • Fig.2 shows, when the source UEO wants to send data stream to base station 10 but it can't communicate with the base station directly, UEO will first detect each direct link connected with it and select those links that can be taken as relay. If m direct links are selected, denoted as L11 , L12, L13... and L1m, UEO will detect whether the data processing capability of the relayers UE1 , UE2...
  • the source UEO divides the data stream into m sub data streams according to each link status of the m direct links (such as channel condition of the direct link, data processing capability of the relayer, the battery condition of the relayer, and so on), and send them to UE1 , UE2, ... and UEm over L11 , L12, ... and L1 m.
  • the source UEO divides the high-rate data stream into m low-rate data streams, the divided sub data streams can be forwarded to base station 10 through each order of relayers whose data processing capability is not very strong. If the data stream transmission rate of the source UE is relatively low, and the data stream processing rate of UE1 , UE2, UE3, ... and UEm is higher than the data stream transmission rate of the source UE, the source UEO sends the copies of the data stream to UE1 , UE2, UE3 ...and UEm over direct links L11 , L12, L13, ...
  • base station 10 can get signals with better quality than the signals over single-path relaying through diversity combination. After base station 10 receives the m data streams from relaying links Ln1 , Ln2, Ln3, ... and Lnm, it will detect the m data streams. If the detection result shows that the m data streams are the m sub data streams divided by the source UEO, base station 10 combines them to restore the original undivided data stream, and sends the restored data stream to the destination UE through RNC 20 and CN 30.
  • the base station will process the m data streams in diversity combination, to get the signal-strengthened data stream, and then sends the combined data stream to the destination UE through RNC 20 and CN 30.
  • RNC 20 and CN 30 A description will be given below to the method of the present invention for enhancing relaying performance of mobile communication systems to be performed by UEO, in conjunction with the flow chart in Fig.3.
  • the source UEO can't communicate with base station 10 directly, it will first detect each direct link connected with it, and selects those links that can be taken as relays (step S10).
  • UEO detects whether the data processing capability of the relayer in each selected direct link can meet the requirement for forwarding data, that is, whether the data stream processing rate of the relayer in each direct link is higher than the data stream transmission rate of the source UE (step S20). 1. If the data stream processing rate of the relayer in each direct link is lower than the data stream transmission rate of the source UE The source UEO divides the data stream to be sent into several sub data streams according to the status of each direct link, and sends them to each relayer over each selected direct link (step S30). Wherein, the status of each direct link may include channel condition of the direct link, data processing capability of the relayer and battery condition of the relayer.
  • the source UEO can obtain the status of each direct link by sending broadcast message to each direct link and from the report messages replied by each direct link. Corresponding to the status of each direct link, the source UE will allocate different load of data stream for it. If the channel condition of the direct link is very good (for example, SNR is very high or BER is very low), the data stream processing rate of the relayer of the direct link is very high and the battery power of the relayer is adequate, this direct link can carry high load of data in unit time, and this direct link should be allocated with high-rate data stream; otherwise, it should be allocated with low-rate data stream. Corresponding to different data transmission rate, each relayer will use different spreading factor to forward the sub data stream, the higher the data rate, the lower the spreading factor.
  • the reduction of spreading factor will result in the decrease of the relayer's processing gain. Therefore, when dividing the data stream into sub data streams, it should be done depending on the status of each direct link, thus different direct link can carry different load.
  • the several sub data streams are sent to base station 10 through the relaying of each relaying link (step S40). 2. If the data stream processing rate of the relayer in each direct link is not lower than the data stream transmission rate of the source
  • the source UEO sends the copies of the data stream respectively to each relayer over each direct link (step S70). After being forwarded by each subsequent relayer order-by-order, the copies of the data stream are sent to base station 10 (step S80).
  • base station 10 receives data streams from relaying links (step
  • base station 10 combines the sub data streams to restore the original undivided data stream, and sends the restored data stream to the destination UE (step S130). Wherein, if the source UEO sends the divided sub data streams with different spreading sequences, base station 10 can combine the sub data streams to restore the original undivided data stream according to the spreading sequences corresponding to the received sub data streams.
  • the data streams will be processed in way of diversity combination, to get the signal-strengthened data stream, and the combined data stream will be sent to the destination UE (step S140).
  • the base station can combine the data streams to get the signal-strengthened data stream, by using MRC (maximum ratio combining) or EGC (equal gain combining).
  • Fig.5 is a block diagram illustrating the structure of the apparatus for enhancing relaying performance of mobile communication systems in accordance with an embodiment of the present invention, wherein the components same as those in conventional network systems and conventional UEs are not given herein.
  • UE 200 includes: a detecting unit 204, for detecting direct links of the UE; a selecting unit 205, for selecting some available direct links from direct links according to the detection result; detecting unit 204 detects the data processing capability of the relayer in each of the selected direct links; if the detecting unit detects that the data processing capability of each relayer meets the requirement for forwarding data, transmitting unit 202 transmits the data stream to be transmitted respectively via each of the selected direct links; if the detecting unit detects that the data processing capability of each relayer can't meet the requirement for forwarding data, dividing unit 201 divides the data stream to be transmitted into data streams capable of being processed by each selected direct link according to the status of each selected direct link, and then transmitting unit 202 transmits the divided data streams over each corresponding selected direct link.
  • status of the direct link includes channel condition of the direct link, data processing capability of the relayer and battery condition of the relayer.
  • detecting unit 102 detects the received data streams. If the detection result shows the data streams are the copies of the original undivided data stream from the same source UE, combining unit 103 combines the data streams to get the signal-strengthened data stream, and sends the combined data stream to the destination UE through transmitting unit 105. If the detection result shows that the data streams are the divided sub data streams, restoring unit 104 combines the sub data streams to restore the original undivided data stream, and sends the restored data stream to the destination UE via transmitting unit 105.
  • the high-rate data stream to be transmitted by the source UE has to be divided into several low-rate data streams, and thus can be forwarded to the base station through the relayers with low data processing capability.
  • the copies of the data stream to be transmitted by the source UE can be forwarded through several relaying links, which is equivalent to sending each path of signal to the base station through spatial diversity, thus the base station can get signals with better quality than the signals over single-path relaying, by using diversity combination.

Abstract

A method is proposed to be performed by a UE (user equipment) for enhancing relaying performance of mobile communication systems, comprising: detecting each direct link of said UE (user equipment); selecting several available direct links from each said direct link according to the detection result; detecting the data processing capability of the relayer of each selected direct link; transmitting said data stream to be transmitted respectively via each said selected direct link if the data processing capability of each relayer meets the requirement for forwarding data; dividing the data stream to be transmitted into several data streams capable of being processed by each selected direct link according to the status of each said selected direct link, if the data processing capability of each relayer can't meet the requirement for forwarding the complete data stream; and transmitting the divided data streams via the corresponding selected direct links.

Description

METHOD AND APPARATUS FOR ENHANCING RELAYING PERFORMANCE OF MOBILE COMMUNICATION SYSTEMS
Field of the Invention The present invention relates generally to a communication method and apparatus, and more particularly, to a method for enhancing relaying performance of mobile communication systems.
Background of the Invention It's well known that, conventional cellular mobile communication systems, such as GSM system, CDMA system and so on, take cell as the basic communication unit. In every cell, the base station, as the relaying center, receives signals from a source user equipment (UE), and then forwards the received signals to the destination UE. Thus it can be seen, in conventional cellular mobile communication systems, the UE communicates with the base station directly, rather than through the relaying of other UEs. In conventional mobile communication systems, the coverage range of each cell is limited. And in sparsely populated regions, it's impossible to deploy a lot of cells to cover these regions entirely due to cost and many other factors. So, the UE can't communicate with the base station when falling into a region that is not covered by a cell. Moreover, because there are a lot of complex buildings in metropolitan areas, dead spots are thus formed in some regions that are even covered by some cells. In a dead spot, the UE can't receive signals from the base station, and can't send signals to the base station either. The above situations are caused due to inherent shortcomings of conventional mobile communication systems. An enhanced technique, named multihop, is introduced for conventional communication systems to overcome these shortcomings, so that a UE can communicate with the base station even if it falls out of the cell's coverage range or in a dead spot. Originally, multihop is a relaying technique used in peer to peer (P2P) networks, for a UE to communicate with a remote UE through relaying of other UEs. When a UE is in a dead spot or falls out of the cell's coverage range, it still can communicate with the base station through relaying of other UEs, by introducing multihop technique in conventional mobile communication systems. Fig.1 illustrates a conventional relaying communication in TD-SCDMA communication system. As it shows, UEO is far away from base station 10 and thus can't communicate with the base station directly, so it has to send signals to base station 10 through n forwardings of UE1 ... UEn. Base station
10 sends the received signals to the destination UE (not displayed here) via RNC 20 and CN 30. Referring to Fig.1 , when signals are forwarded (relayed), the UE sending the relayed signals and the UE/base station receiving the relayed signals can communicate through a direct connection. For clarity, the direct connection between the UE sending the relayed signals and the UE/base station receiving the relayed signals is called as a link below. Direct connection L0, L1 ... Ln-1 and Ln in Fig.1 are all called as link. For a source UE, each link connected with it is called as a direct link. The source UE can send signals to each relayer through each direct link, and then each relayer can forward the signals to the next relayer or the base station. In Fig.1 , when the source UEO sends signals through direct link L0, UE1 as the first-order relayer forwards the signals to the next-order UE, and the next-order UE forwards the signals again. In the last, after n-order forwarding, UEn sends the signals to base station 10 via Ln. As described above, a UE can communicate with the base station through relaying of other relayers, by introducing multihop technique in conventional mobile communication systems. But the processing capability of a relayer is generally not so strong as that of the base station, so relayers can't process high-rate data streams as the base station. Therefore, the source UE can't expect to send high-rate data streams to the base station in this relaying way over links constructed by relayers. Moreover, even if low-rate data streams are transmitted in the way as shown in Fig.1 , the signals reaching the base station after n-order forwardings are generally very weak and can't meet the QoS requirement, because the signal processing capability of the relayer is not so strong as that of the base station.
Summary of the Invention An object of the present invention is to provide a method and apparatus for enhancing relaying performance of mobile communication systems. With this method and apparatus, the high-rate data stream from the source UE can be divided into several low-rate data stream and then forwarded to the base station through relayers without high-rate data processing capability. Another object of the present invention is to provide a method and apparatus for enhancing relaying performance of mobile communication systems. With this method and apparatus, a strengthened signal can be obtained through diversity technique at the base station after a low-rate data stream from the source UE is forwarded over several links. A method is proposed for enhancing relaying performance of mobile communication systems in the present invention, to be performed by a user equipment, comprising steps of: detecting direct links of the user equipment; selecting several available direct links from the direct links according to the detection result; detecting the data processing capability of the relayer of each selected direct link; transmitting the data stream to be sent over the selected direct links, if the data processing capability of each relayer can satisfy the requirement for forwarding data; if the data processing capability of each relayer can't meet the requirement for forwarding data, dividing the data stream to be sent into several data streams capable of being processed by each selected direct link according to the status of each selected direct link, and transmitting the divided data streams over each corresponding selected direct link. A method is proposed in the present invention for enhancing relaying performance of mobile communication systems, to be performed by a network system, comprising steps of: receiving data streams transferred over several links; detecting the received data streams; combining the data streams to get the signal-strengthened data stream if the detection result indicates that the data streams are copies of the undivided data stream from the same source user equipment, and transmitting the combined data stream to the destination user equipment; combining the sub data streams to restore the original undivided data stream if the detection result indicates that the data steams are the divided sub data streams, and transmitting the restored data stream to the destination user equipment.
Brief Description of the Drawings Fig.1 is a schematic diagram illustrating the relaying communication in existing TD-SCDMA communication system; Fig.2 is a schematic diagram illustrating the relaying communication in TD-SCDMA system in accordance with the present invention; Fig.3 is a flow chart illustrating the method for enhancing relaying performance of mobile communication systems to be performed by a UE in accordance with the present invention; Fig. 4 is a flow chart illustrating the method for enhancing relaying performance of mobile communication systems to be performed by the base station in accordance with the present invention; Fig.5 is a block diagram illustrating the structure of the apparatus for enhancing relaying performance of mobile communication systems in accordance with an embodiment of the present invention.
Detailed Description of the Invention The main idea of the present invention can be summarized as: when a source UE can't communicate with the base station directly, it will detect whether the data processing capability of the relayer in each direct link can meet the requirement for forwarding data, that is, whether the data stream processing rate of the relayer in each direct link is higher than the data stream transmission rate of the source UE. If the data stream processing rate of the relayer in each direct link is lower than the data stream transmission rate of the source UE, the source UE divides the data stream to be transmitted into several sub data streams capable of being processed by the relayers, and then the sub data streams are forwarded through each relayer to the base station. If the data stream processing rate of the relayer in each direct link is higher than the data stream transmission rate of the source UE, copies of the data stream to be transmitted will be forwarded to the base station through the relayers. To clarify the main idea of the present invention, a detailed description will be offered below in conjunction with Fig.2. As Fig.2 shows, when the source UEO wants to send data stream to base station 10 but it can't communicate with the base station directly, UEO will first detect each direct link connected with it and select those links that can be taken as relay. If m direct links are selected, denoted as L11 , L12, L13... and L1m, UEO will detect whether the data processing capability of the relayers UE1 , UE2... and UEm in the m direct links can meet the requirement for forwarding data. If the data stream transmission rate of the source UEO is high, and the data stream processing rate of UE1 , UE2... and UEm is lower than the data stream transmission rate of the source UEO, the source UEO divides the data stream into m sub data streams according to each link status of the m direct links (such as channel condition of the direct link, data processing capability of the relayer, the battery condition of the relayer, and so on), and send them to UE1 , UE2, ... and UEm over L11 , L12, ... and L1 m. The m sub data streams forwarded through UE1 , UE2, ... and UEm are then forwarded by subsequent relayers (n-order is given in the figure), and reach base station 10 over Ln1 , Ln2, ... and Lnm. Because the source UEO divides the high-rate data stream into m low-rate data streams, the divided sub data streams can be forwarded to base station 10 through each order of relayers whose data processing capability is not very strong. If the data stream transmission rate of the source UE is relatively low, and the data stream processing rate of UE1 , UE2, UE3, ... and UEm is higher than the data stream transmission rate of the source UE, the source UEO sends the copies of the data stream to UE1 , UE2, UE3 ...and UEm over direct links L11 , L12, L13, ... and L1 m. After the m copies of the data stream forwarded by UE1 , UE2, UE, ... and UEm are then forwarded by each subsequent relayers order-by-order (the figure shows n orders), they will reach base station 10 over relaying links Ln1 , Ln2, Ln3, ... and Lnm. The source UEO forwards the copies of the data stream to be transmitted to base station 10 through m relaying links, which is equivalent to forwarding each path of signals to base station 10 through spatial diversity, thus base station
10 can get signals with better quality than the signals over single-path relaying through diversity combination. After base station 10 receives the m data streams from relaying links Ln1 , Ln2, Ln3, ... and Lnm, it will detect the m data streams. If the detection result shows that the m data streams are the m sub data streams divided by the source UEO, base station 10 combines them to restore the original undivided data stream, and sends the restored data stream to the destination UE through RNC 20 and CN 30. If the detection result shows that the m data streams are the copies of the undivided data stream from the same source UEO, the base station will process the m data streams in diversity combination, to get the signal-strengthened data stream, and then sends the combined data stream to the destination UE through RNC 20 and CN 30. A description will be given below to the method of the present invention for enhancing relaying performance of mobile communication systems to be performed by UEO, in conjunction with the flow chart in Fig.3. When the source UEO can't communicate with base station 10 directly, it will first detect each direct link connected with it, and selects those links that can be taken as relays (step S10). Then, UEO detects whether the data processing capability of the relayer in each selected direct link can meet the requirement for forwarding data, that is, whether the data stream processing rate of the relayer in each direct link is higher than the data stream transmission rate of the source UE (step S20). 1. If the data stream processing rate of the relayer in each direct link is lower than the data stream transmission rate of the source UE The source UEO divides the data stream to be sent into several sub data streams according to the status of each direct link, and sends them to each relayer over each selected direct link (step S30). Wherein, the status of each direct link may include channel condition of the direct link, data processing capability of the relayer and battery condition of the relayer. The source UEO can obtain the status of each direct link by sending broadcast message to each direct link and from the report messages replied by each direct link. Corresponding to the status of each direct link, the source UE will allocate different load of data stream for it. If the channel condition of the direct link is very good (for example, SNR is very high or BER is very low), the data stream processing rate of the relayer of the direct link is very high and the battery power of the relayer is adequate, this direct link can carry high load of data in unit time, and this direct link should be allocated with high-rate data stream; otherwise, it should be allocated with low-rate data stream. Corresponding to different data transmission rate, each relayer will use different spreading factor to forward the sub data stream, the higher the data rate, the lower the spreading factor. The reduction of spreading factor will result in the decrease of the relayer's processing gain. Therefore, when dividing the data stream into sub data streams, it should be done depending on the status of each direct link, thus different direct link can carry different load. After being forwarded by each subsequent relayer order-by-order, the several sub data streams are sent to base station 10 through the relaying of each relaying link (step S40). 2. If the data stream processing rate of the relayer in each direct link is not lower than the data stream transmission rate of the source
UE The source UEO sends the copies of the data stream respectively to each relayer over each direct link (step S70). After being forwarded by each subsequent relayer order-by-order, the copies of the data stream are sent to base station 10 (step S80).
A description will be given below to the method of the present invention to be performed by base station 10 for enhancing relaying performance of mobile communication systems, in conjunction with the flow chart in Fig.4. First, base station 10 receives data streams from relaying links (step
S100), and then detects the data streams (step S110). (1) If the detection result shows that the data streams are the sub data streams divided by UEO, base station 10 combines the sub data streams to restore the original undivided data stream, and sends the restored data stream to the destination UE (step S130). Wherein, if the source UEO sends the divided sub data streams with different spreading sequences, base station 10 can combine the sub data streams to restore the original undivided data stream according to the spreading sequences corresponding to the received sub data streams. (2) If the detection result shows that the data streams are the copies of the original undivided data stream from the same source UEO, the data streams will be processed in way of diversity combination, to get the signal-strengthened data stream, and the combined data stream will be sent to the destination UE (step S140). Wherein, the base station can combine the data streams to get the signal-strengthened data stream, by using MRC (maximum ratio combining) or EGC (equal gain combining).
The method for enhancing relaying performance of mobile communication systems in the present invention, can be implemented in software modules in the UE and base station, or hardware modules with corresponding software functions, or in combination of software and hardware. Fig.5 is a block diagram illustrating the structure of the apparatus for enhancing relaying performance of mobile communication systems in accordance with an embodiment of the present invention, wherein the components same as those in conventional network systems and conventional UEs are not given herein. As Fig.5 shows, UE 200 includes: a detecting unit 204, for detecting direct links of the UE; a selecting unit 205, for selecting some available direct links from direct links according to the detection result; detecting unit 204 detects the data processing capability of the relayer in each of the selected direct links; if the detecting unit detects that the data processing capability of each relayer meets the requirement for forwarding data, transmitting unit 202 transmits the data stream to be transmitted respectively via each of the selected direct links; if the detecting unit detects that the data processing capability of each relayer can't meet the requirement for forwarding data, dividing unit 201 divides the data stream to be transmitted into data streams capable of being processed by each selected direct link according to the status of each selected direct link, and then transmitting unit 202 transmits the divided data streams over each corresponding selected direct link.
Wherein, status of the direct link includes channel condition of the direct link, data processing capability of the relayer and battery condition of the relayer. After receiving unit 101 in network system 100 receives the data streams from relaying links, detecting unit 102 detects the received data streams. If the detection result shows the data streams are the copies of the original undivided data stream from the same source UE, combining unit 103 combines the data streams to get the signal-strengthened data stream, and sends the combined data stream to the destination UE through transmitting unit 105. If the detection result shows that the data streams are the divided sub data streams, restoring unit 104 combines the sub data streams to restore the original undivided data stream, and sends the restored data stream to the destination UE via transmitting unit 105.
Beneficial Results of the Invention As described above, with regard to the method and apparatus for enhancing relaying performance of mobile communication systems as provided in the present invention, when the data stream processing rate of the relayer is lower than the data stream transmission rate of the source UE, the high-rate data stream to be transmitted by the source UE has to be divided into several low-rate data streams, and thus can be forwarded to the base station through the relayers with low data processing capability. When the data stream processing rate of the relayer is higher than the data stream transmission rate of the source UE, the copies of the data stream to be transmitted by the source UE can be forwarded through several relaying links, which is equivalent to sending each path of signal to the base station through spatial diversity, thus the base station can get signals with better quality than the signals over single-path relaying, by using diversity combination. It is to be understood by those skilled in the art that the method and apparatus for enhancing relaying performance of mobile communication systems as disclosed in this invention can be modified considerably without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

What is claimed is:
1. A method to be performed by a user terminal for enhancing relaying performance in mobile communication systems, comprising: (a) detecting each direct link of said user terminal; (b) selecting several available direct links from each said direct link according to the detecting result; (c) transmitting the data stream to be transmitted via the selected direct links;
2. The method in claim 1 , further comprising: detecting the data processing capability of the relayer of each selected direct link; transmitting said data stream to be transmitted respectively via each said selected direct link in step (c) if the data processing capability of each relayer meets the requirement for forwarding data.
3. The method in claim 2, further comprising: dividing the data stream to be transmitted into several data streams capable of being processed by each selected direct link according to the status of each said selected direct link, if the data processing capability of each relayer can't meet the requirement for forwarding data; wherein the several data streams divided in step (c) are transmitted via each corresponding selected direct link.
4. The method in claim 3, wherein the status of said direct link at least includes one of the channel situation of said direct link, the data processing capability and the battery condition of the relayer.
5. A method to be performed by a network system for enhancing relaying performance in mobile communication systems, comprising: (1) receiving data streams transferred via several links; (2) detecting the several received data streams; (3) combining the several data streams to get the signal-strengthened data stream if the detecting result indicates that the several data streams are the same undivided data stream from the same source user terminal; (4) transmitting the combined data stream to the destination user terminal.
6. The method in claim 5, further comprising: combining the several sub data streams to restore the data stream before being divided if the detecting result indicates that the several data steams are each divided sub data stream; transmitting the restored data stream to the destination user terminal.
7. A user terminal, comprising: a detecting unit, for detecting each direct link of said user terminal; a selecting unit, for selecting several available direct links from each direct link according to the detecting result; a transmitting unit, for transmitting the data stream to be transmitted via said selected direct link.
8. The user terminal in claim 7, wherein: said detecting unit, still for detecting the data processing capability of each relayer of each said selected direct link; said transmitting unit transmits the data stream to be transmitted respectively via each said selected direct link if said detecting unit detects that the data processing capability of each relayer meets the requirement for forwarding data.
9. The user terminal in claim 8, further comprising: a dividing unit, for dividing the data stream to be transmitted into data streams capable of being processed by each said selected direct link according to the status of each said selected direct link, when said detecting unit detects that the data processing capability of each relayer can't meet the requirement for forwarding data; wherein said transmitting unit transmits the several divided data streams via each corresponding selected direct link.
10. The user terminal in claim 9, wherein the status of said direct link at least includes one of the channel situations of said direct link, the data processing capability and the battery condition of the relayer.
11. A network system in mobile communication systems, comprising: a receiving unit, for receiving data streams transferred over several links; a detecting unit, for detecting the several received data streams; a combining unit, for combining the several data streams to get the signal-strengthened data stream if the detecting result indicates the several data streams are the same undivided data stream from the same source user terminal; a transmitting unit, for transmitting the combined data stream to the destination user terminal.
12. The network system in claim 11 , further comprising: a restoring unit, for combing the several sub data streams to restore the data stream before being divided when the detecting result indicates that the several data streams are each undivided sub data stream; wherein said transmitting unit transmits the restored data stream to the destination user terminal.
PCT/IB2004/052521 2003-11-28 2004-11-24 Method and apparatus for enhancing relaying performance of mobile communication systems WO2005053338A1 (en)

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