TW201815220A - Method of performing device-to-device communication and related communication system - Google Patents

Method of performing device-to-device communication and related communication system Download PDF

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TW201815220A
TW201815220A TW106108255A TW106108255A TW201815220A TW 201815220 A TW201815220 A TW 201815220A TW 106108255 A TW106108255 A TW 106108255A TW 106108255 A TW106108255 A TW 106108255A TW 201815220 A TW201815220 A TW 201815220A
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base station
point
user device
resource
resource pool
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TWI633803B (en
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莊明道
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宏碁股份有限公司
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

A communication system includes first user equipment, second user equipment, a first base station and a second base station. The first base station provides D2D information associated with the first and second base stations to the first user equipment. The D2D information at least includes the Rx resource pools, the Tx resource pools and the exceptional resource pools of the first and second base stations. According to a resource scanning criteria, the first user equipment scans the Rx resource pool and the exceptional resource pool of the second base station for acquiring an available D2D resource. According to a resource selecting criteria, the first user equipment uses a current D2D resource from the Rx resource pool and the exceptional resource pool of the first base station for conduction D2D communication with the second user equipment, or uses the available D2D resource for conducting D2D communication with the second user equipment.

Description

進行點對點通訊之方法及相關通訊系統Method for performing point-to-point communication and related communication system

本發明相關於一種進行點對點通訊之方法及相關通訊系統，尤指一種能維持服務連續性之點對點通訊方法及相關通訊系統。The present invention relates to a method and related communication system for performing point-to-point communication, and more particularly to a point-to-point communication method and related communication system capable of maintaining service continuity.

為了維持行動通訊的服務品質和連續性，第三代合作夥伴計劃(3rd Generation Partnership Project, 3GPP)規範針對行動狀態要求在系統資訊區塊(system information block)SIB21中加入特殊資源池(exceptional pool, commTxPoolExceptional)。針對閒置狀態切換至連接狀態、無線連結失敗(radio link failure, RLF)和無線資源控制(radio resource control, RRC)重新組態等非遞交之應用，特殊資源池commTxPoolExceptional是由目前服務基地台來提供，而使用者裝置會預先偵測(pre-sense)特殊資源池commTxPoolExceptional以維持服務連續性。另一方面，針對遞交(handover)之應用，特殊資源池commTxPoolExceptional是由鄰近目標基地台來提供，而使用者裝置會隨機從特殊資源池commTxPoolExceptional中選取可用資源以維持服務連續性。In order to maintain the service quality and continuity of mobile communications, the 3rd Generation Partnership Project (3GPP) specifications for mobile states require that a special resource pool (exceptional pool, commTxPoolExceptional). For non-submission applications such as switching from idle state to connection state, radio link failure (RLF) and radio resource control (RRC) reconfiguration, the special resource pool commTxPoolExceptional is provided by the current service base station , And the user device pre-senses the special resource pool commTxPoolExceptional in order to maintain service continuity. On the other hand, for handover applications, the special resource pool commTxPoolExceptional is provided by the neighboring target base station, and the user device randomly selects available resources from the special resource pool coMTxPoolExceptional to maintain service continuity.

點對點(device-to-device, D2D)通訊是一種允許不同使用者裝置通過頻譜資源直接進行點對點通訊的技術，它能夠提高蜂巢式網路的頻譜效率，降低使用者裝置之發射功率，在一定程度上解決無線通訊系統頻譜資源匱乏的問題。3GPP規範針對D2D應用定義了兩種傳輸模式。第一種D2D傳輸模式是由網路端控制，使用者裝置唯有在收到基地台發送的D2D資源後才能執行D2D通訊。亦即，基地台會先發送D2D許可給D2D發送端使用者裝置，D2D發送端使用者裝置再傳送D2D訊號給D2D接收端使用者裝置。第二種D2D傳輸模式是由使用者裝置控制，而不需要透過網路端。亦即，使用者裝置會隨機選取資源池內的可用資源以進行D2D通訊。Device-to-device (D2D) communication is a technology that allows different user devices to directly perform point-to-point communication through spectrum resources. It can improve the spectral efficiency of cellular networks and reduce the transmit power of user devices to a certain extent. It solves the problem of lack of spectrum resources in wireless communication systems. The 3GPP specification defines two transmission modes for D2D applications. The first D2D transmission mode is controlled by the network. The user device can only perform D2D communication after receiving the D2D resources sent by the base station. That is, the base station first sends the D2D permission to the D2D transmitting user device, and then the D2D transmitting user device sends the D2D signal to the D2D receiving user device. The second D2D transmission mode is controlled by the user device and does not need to go through the network. That is, the user device randomly selects available resources in the resource pool for D2D communication.

當使用者裝置在進行D2D通訊的期間移動到兩基地台的覆蓋範圍交界處時，此時可能需要從目前服務基地台遞交至鄰近目標基地台以維持通訊品質。依據3GPP規範，使用者裝置需要等到鄰近目標基地台提供相關於其特殊資源池commTxPoolExceptional之資訊後，才能隨機從鄰近目標基地台之特殊資源池commTxPoolExceptional選取可用資源以維持D2D服務連續性。然而，在接收鄰近目標基地台的SIB21和掃描特殊資源池需要一段時間，D2D通訊可能會在取得可用D2D資源之前就中斷，因此需要一種能在遞交期間維持服務連續性之點對點通訊方法及相關通訊系統。When the user device moves to the junction of the coverage areas of the two base stations during the D2D communication, at this time, the user device may need to be delivered from the current serving base station to the neighboring target base station to maintain the communication quality. According to 3GPP specifications, the user device needs to wait for the neighboring target base station to provide information related to its special resource pool commTxPoolExceptional before randomly selecting available resources from the special resource pool commTxPoolExceptional of the neighboring target base station to maintain D2D service continuity. However, it takes a while to receive SIB21 and scan special resource pools near the target base station, and D2D communication may be interrupted before the available D2D resources are obtained. Therefore, a point-to-point communication method and related communication that can maintain service continuity during the submission period is needed system.

本發明提供一種在一通訊系統中進行點對點通訊之方法，該通訊系統包含至少一第一使用者裝置、一第二使用者裝置、一第一基地台和一第二基地台。該方法包含該第一使用者裝置駐留在該第一基地台；該第一基地台提供相關於該第一基地台和該第二基地台之點對點資訊給該第一使用者裝置，其中該點對點資訊至少包含該第一基地台之發送資源池、該第一基地台之接收資源池、該第一基地台之特別資源池、該第二基地台之發送資源池、該第二基地台之接收資源池，以及該第二基地台之特別資源池；該第一使用者裝置依據該第一基地台所提供之一資源掃描準則來掃描該第二基地台之發送資源池、該第二基地台之接收資源池或該第二基地台之特別資源池以取得一可用點對點資源；該第一使用者裝置依據該第一基地台所提供之一資源選定準則來選擇該第一基地台之特別資源池或該第一基地台之發送資源池中的一現有點對點資源來和該第二使用者裝置進行點對點通訊，或是選擇該可用點對點資源來和該第二使用者裝置進行點對點通訊。The invention provides a method for performing point-to-point communication in a communication system. The communication system includes at least a first user device, a second user device, a first base station and a second base station. The method includes the first user device residing at the first base station; the first base station providing point-to-point information related to the first base station and the second base station to the first user device, wherein the point-to-point The information includes at least the sending resource pool of the first base station, the receiving resource pool of the first base station, the special resource pool of the first base station, the sending resource pool of the second base station, and the receiving of the second base station A resource pool, and a special resource pool of the second base station; the first user device scans the sending resource pool of the second base station, and the second base station according to a resource scanning criterion provided by the first base station; Receiving a resource pool or a special resource pool of the second base station to obtain an available point-to-point resource; the first user device selects the special resource pool or the first base station according to a resource selection criterion provided by the first base station An existing point-to-point resource in the sending resource pool of the first base station to perform point-to-point communication with the second user device, or select the available point-to-point resource to communicate with the Two user devices communicate point to point.

本發明另提供一種支援點對點通訊之一通訊系統，其包含一第一基地台、一第二基地台、一第一使用者裝置，和一第二基地台。該第一基地台用來提供相關於該第一基地台和該第二基地台之點對點資訊、一資源掃描準則，以及一資源選定準則，其中該點對點資訊至少包含該第一基地台之發送資源池、該第一基地台之接收資源池、該第一基地台之特別資源池、該第二基地台之發送資源池、該第二基地台之接收資源池，以及該第二基地台之特別資源池。該第一使用者裝置駐留在該第一基地台，且依據該資源掃描準則來掃描該第二基地台之發送資源池、該第二基地台之接收資源池或該第二基地台之特別資源池以取得一可用點對點資源，再依據該資源選定準則來選擇該第一基地台之特別資源池或該第一基地台之發送資源池中的一現有點對點資源來和該第二使用者裝置進行點對點通訊，或是選擇該可用點對點資源來和該第二使用者裝置進行點對點通訊。The present invention further provides a communication system supporting point-to-point communication, which includes a first base station, a second base station, a first user device, and a second base station. The first base station is used to provide point-to-point information, a resource scanning criterion, and a resource selection criterion related to the first base station and the second base station. The point-to-point information includes at least the transmission resources of the first base station. Pool, receiving resource pool of the first base station, special resource pool of the first base station, sending resource pool of the second base station, receiving resource pool of the second base station, and special resources of the second base station Resource pool. The first user device resides in the first base station, and scans a resource pool for transmission of the second base station, a resource pool for reception of the second base station, or special resources of the second base station according to the resource scanning criterion. Pool to obtain an available point-to-point resource, and then select a special resource pool of the first base station or an existing point-to-point resource in the sending resource pool of the first base station to perform with the second user device according to the resource selection criteria Point-to-point communication, or selecting the available point-to-point resources to perform point-to-point communication with the second user device.

第1圖為本發明支援點對點技術之通訊系統100的功能方塊圖。通訊系統100包含複數個基地台(網路端)和複數個使用者裝置(用戶端)。為了說明目的，第1圖僅顯示了兩個基地台BS1~BS2和標示兩個使用者裝置UE1~UE2。在本發明實施例中，基地台BS1~BS2可為演化式基地台(evolved-NobeB, eNB)、基地收發系統(base transceiver system, BTS)、存取點(access point)，或微型基地台(femtocell)。使用者裝置UE1~UE2可為行動電話、個人數位助理(personal digital assistant, PDA)、掌上型(handheld)電腦、平板(tablet)電腦、迷你桌面(nettop)電腦、筆記型(laptop)電腦，或其它具備D2D通訊功能之裝置。然而，基地台和使用者裝置之種類和數量並不限定本發明之範疇。FIG. 1 is a functional block diagram of a communication system 100 supporting peer-to-peer technology according to the present invention. The communication system 100 includes a plurality of base stations (network terminals) and a plurality of user devices (user terminals). For the purpose of illustration, FIG. 1 shows only two base stations BS1 to BS2 and two user devices UE1 to UE2. In the embodiment of the present invention, the base stations BS1 to BS2 may be evolved-NobeB (eNB), a base transceiver system (BTS), an access point, or a micro base station ( femtocell). The user equipment UE1 ~ UE2 can be mobile phones, personal digital assistants (PDAs), handheld computers, tablet computers, nettop computers, laptop computers, or Other devices with D2D communication function. However, the types and number of base stations and user devices do not limit the scope of the present invention.

使用者裝置UE1位於基地台BS1的覆蓋範圍S1，因此可透過基地台BS1和覆蓋範圍S1內之其它使用者裝置進行通訊。使用者裝置UE2位於基地台BS2的覆蓋範圍S2，因此可透過基地台BS2和覆蓋範圍S2內之其它使用者裝置進行通訊。此外，位於不同基地台覆蓋範圍之使用者裝置亦可透過D2D技術進行資料傳輸。舉例來說，位於覆蓋範圍S1內之使用者裝置UE1可和位於覆蓋範圍S2內之使用者裝置UE2進行D2D通訊。The user equipment UE1 is located in the coverage area S1 of the base station BS1, and therefore can communicate with other user equipments in the coverage area S1 through the base station BS1. The user equipment UE2 is located in the coverage area S2 of the base station BS2, and therefore can communicate with other user equipments in the coverage area S2 through the base station BS2. In addition, user devices located in different base stations can also use D2D technology for data transmission. For example, the user device UE1 located in the coverage area S1 may perform D2D communication with the user device UE2 located in the coverage area S2.

第2圖為本發明在通訊系統100中進行D2D通訊之方法流程圖，其包含下列步驟。FIG. 2 is a flowchart of a D2D communication method in the communication system 100 according to the present invention, which includes the following steps.

步驟210： 第一使用者裝置駐留在第一基地台；執行步驟220。Step 210: The first user device resides at the first base station; step 220 is performed.

步驟220： 網路端提供至少相關於第一基地台和第二基地台之D2D資訊給第一使用者裝置；執行步驟230。Step 220: The network provides D2D information related to at least the first base station and the second base station to the first user device; step 230 is performed.

步驟230： 網路端提供一資源掃描準則和一資源選定準則給第一使用者裝置；執行步驟240。Step 230: The network provides a resource scanning criterion and a resource selection criterion to the first user device. Step 240 is executed.

步驟240： 第一使用者裝置依據資源掃描準則來掃描第二基地台之資源池以取得一可用D2D資源；執行步驟250。Step 240: The first user device scans the resource pool of the second base station to obtain an available D2D resource according to the resource scanning criterion; step 250 is performed.

步驟250： 第一使用者裝置判斷資源選定準則中是否有任一條件成立；若是，執行步驟270；若否，執行步驟260。Step 250: The first user device determines whether any condition in the resource selection criteria is met; if yes, execute step 270; if not, execute step 260.

步驟260： 第一使用者裝置依據第一基地台之特別資源池(exceptional resource pool)或發送資源池(Tx resource pool)來和第二使用者裝置進行D2D通訊；執行步驟280。Step 260: The first user device performs D2D communication with the second user device according to an exceptional resource pool or a Tx resource pool of the first base station; step 280 is performed.

步驟270： 第一使用者裝置依據第二基地台之特別資源池或發送資源池來和第二使用者裝置進行D2D通訊；執行步驟280。Step 270: The first user device performs D2D communication with the second user device according to the special resource pool or the sending resource pool of the second base station; step 280 is performed.

步驟280： 第一使用者裝置判斷是否需要進行遞交；若是，執行步驟290；若否，執行步驟300。Step 280: The first user device determines whether a submission is required; if yes, execute step 290; if no, execute step 300.

步驟290： 第一使用者裝置從第一基地台遞交至第二基地台，並依據第二基地台之特別資源池或發送資源池來進行D2D通訊；執行步驟300。Step 290: The first user device is delivered from the first base station to the second base station, and performs D2D communication according to the special resource pool or the sending resource pool of the second base station; step 300 is performed.

步驟300： 執行其它運作。Step 300: Perform other operations.

依據相關3GPP規範定義之基地台選擇標準(cell selection criteria)或基地台重選標準(cell reselection criteria)，使用者裝置會選擇訊號品質最好的基地台來作為目前服務基地台。以第1圖所示之通訊系統100來說，使用者裝置UE1在步驟210中會駐留在基地台BS1，而使用者裝置UE2在步驟210中會駐留在基地台BS2。為了簡化說明，接下來以使用者裝置UE1之運作來說明。According to the cell selection criteria or cell reselection criteria defined by the relevant 3GPP specifications, the user device will select the base station with the best signal quality as the current serving base station. In the communication system 100 shown in FIG. 1, the user equipment UE1 will reside at the base station BS1 in step 210, and the user equipment UE2 will reside at the base station BS2 in step 210. In order to simplify the description, the operation of the user device UE1 is described below.

在步驟220中，網路端可提供相關於目前服務基地台和至少一鄰近目標基地台之D2D資訊給使用者裝置。以第1圖所示之通訊系統100來說，網路端可透過基地台BS1提供相關於基地台BS1~BS2之D2D資訊給覆蓋範圍S1內的所有使用者裝置，並透過基地台BS2提供相關於基地台BS1~BS2之D2D資訊給覆蓋範圍S2內的所有使用者裝置。為了說明目的，假設使用者裝置UE1是D2D發送端裝置，而使用者裝置UE2是D2D接收端裝置。使用者裝置UE1在步驟220中會接收到第一基地台BS1之發送資源池、第二基地台BS2之發送資源池、第一基地台BS1之接收資源池(Rx resource pool)、第二基地台BS2之接收資源池、第一基地台BS1之特殊資源池、第二基地台BS2之特殊資源池、第一基地台BS1之區域計算方法，以及第二基地台BS2之區域計算方法。In step 220, the network can provide D2D information related to the current serving base station and at least one neighboring target base station to the user device. Taking the communication system 100 shown in FIG. 1, the network can provide D2D information related to base stations BS1 to BS2 through base station BS1 to all user devices in the coverage area S1, and provide related information through base station BS2 The D2D information at the base stations BS1 ~ BS2 is provided to all user devices in the coverage area S2. For the purpose of illustration, it is assumed that the user device UE1 is a D2D transmitting device and the user device UE2 is a D2D receiving device. The user device UE1 receives the transmission resource pool of the first base station BS1, the transmission resource pool of the second base station BS2, the reception resource pool (Rx resource pool) of the first base station BS1, and the second base station in step 220. The receiving resource pool of BS2, the special resource pool of the first base station BS1, the special resource pool of the second base station BS2, the area calculation method of the first base station BS1, and the area calculation method of the second base station BS2.

在步驟230中，網路端可提供資源掃描準則和資源選定準則給使用者裝置。以第1圖所示之通訊系統100來說，網路端可透過第一基地台BS1提供資源池掃描方式給覆蓋範圍S1內的所有使用者裝置，並透過第二基地台BS2提供資源池掃描方式給覆蓋範圍S2內的所有使用者裝置。In step 230, the network may provide resource scanning criteria and resource selection criteria to the user device. Taking the communication system 100 shown in FIG. 1, the network can provide a resource pool scanning method to all user devices in the coverage area S1 through the first base station BS1 and a resource pool scanning through the second base station BS2. The mode is provided to all user devices in the coverage area S2.

在本發明一實施例中，基地台可透過廣播SIB21來發送D2D資訊、資源掃描準則和資源選定準則給覆蓋範圍內的所有使用者裝置。在本發明另一實施例中，基地台可透過一專門訊息來發送D2D資訊、資源掃描準則和資源選定準則給覆蓋範圍內的所有使用者裝置，例如透過無線資源控制重新組態( RRC reconfiguration)訊息。然而，基地台發送D2D資訊、資源掃描準則和資源選定準則之方式並不限定本發明之範疇。In an embodiment of the present invention, the base station may send D2D information, resource scanning criteria, and resource selection criteria to all user devices in the coverage area by broadcasting the SIB21. In another embodiment of the present invention, the base station may send D2D information, resource scanning criteria, and resource selection criteria to all user devices in the coverage area through a special message, for example, through radio resource control reconfiguration (RRC reconfiguration) message. However, the manner in which the base station sends D2D information, resource scanning criteria, and resource selection criteria does not limit the scope of the invention.

在本發明中，使用者裝置在步驟230中接收到之資源掃描準則可包含下列條件至少其中之一：In the present invention, the resource scanning criterion received by the user device in step 230 may include at least one of the following conditions:

條件(1)：目前服務基地台之訊號強度低於一第一預定臨界值；Condition (1): The signal strength of the current serving base station is lower than a first predetermined threshold;

條件(2)：目前服務基地台之品質低於一第一預定標準；Condition (2): The quality of the current serving base station is lower than a first predetermined standard;

條件(3)：目前服務基地台之訊號強度低於鄰近目標基地台之訊號強度；Condition (3): The signal strength of the current serving base station is lower than the signal strength of the neighboring target base station;

條件(4)：目前服務基地台之品質低於鄰近基地台之品質；以及Condition (4): The quality of the serving base station is currently lower than that of the neighboring base station; and

條件(5)：從網路端接受到之空中下載(over the air, OTA)訊息中包含遞交指令。Condition (5): The over-air (OTA) message received from the network contains a submission instruction.

在本發明中，使用者裝置在步驟230中接收到之資源選定準則可包含下列條件中至少其中之一：In the present invention, the resource selection criteria received by the user device in step 230 may include at least one of the following conditions:

條件(6)：目前服務基地台之訊號強度高於一第二預定臨界值；Condition (6): The signal strength of the current serving base station is higher than a second predetermined threshold;

條件(7)：目前服務基地台之品質高於一第二預定標準；Condition (7): The quality of the current serving base station is higher than a second predetermined standard;

條件(8)：目前服務基地台之訊號強度高於鄰近目標基地台之訊號強度；以及Condition (8): The signal strength of the current serving base station is higher than the signal strength of the neighboring target base station; and

條件(9)：目前服務基地台之品質高於鄰近基地台之品質。Condition (9): The quality of the serving base station is currently higher than that of the neighboring base station.

在步驟240中，第一使用者裝置會依據資源掃描準則來掃描第二基地台之資源池。更明確地說，第一使用者裝置會在資源掃描準則中任一條件成立時掃描第二基地台之資源池。為了說明目的，假設使用者裝置UE1是D2D發送端裝置，而使用者裝置UE2是D2D接收端裝置。對使用者裝置UE1來說，第一基地台S1是目前服務基地台，而第二基地台S2是鄰近目標基地台。當資源掃描準則中的條件(1)~(4)任一成立時，代表鄰近目標基地台相較於目前服務基地台能提供品質較好的D2D資源。當資源掃描準則中的條件(5)成立時，代表依據網路端指示鄰近目標基地台所提供的D2D資源有優先權。因此，當資源掃描準則中條件(1)~(5)任一成立時，使用者裝置UE1會在步驟240中掃描第二基地台BS2之資源池以取得可用的D2D資源。In step 240, the first user device scans the resource pool of the second base station according to the resource scanning criterion. More specifically, the first user device scans the resource pool of the second base station when any one of the conditions in the resource scanning criterion is satisfied. For the purpose of illustration, it is assumed that the user device UE1 is a D2D transmitting device and the user device UE2 is a D2D receiving device. For the user device UE1, the first base station S1 is the current serving base station, and the second base station S2 is the neighboring target base station. When any one of the conditions (1) to (4) in the resource scanning criterion is satisfied, it means that the neighboring target base station can provide D2D resources with better quality than the current serving base station. When the condition (5) in the resource scanning criterion is satisfied, the representative has priority according to the network end indicating that the D2D resource provided by the neighboring target base station has priority. Therefore, when any one of the conditions (1) to (5) in the resource scanning criterion is satisfied, the user device UE1 scans the resource pool of the second base station BS2 in step 240 to obtain available D2D resources.

在步驟250中， 使用者裝置UE1會判斷資源選定準則中是否有任一條件成立。當資源選定準則中的條件(6)~(7)任一成立時，代表目前服務基地台所提供的D2D資源符合特定品質要求。當資源掃描準則中的條件(8)~(9)任一成立時成立時，代表目前服務基地台相較於鄰近目標基地台能提供品質較好的D2D資源。因此，當資源選定準則中條件(6)~(9)任一成立時，使用者裝置UE1會在步驟260中使用第一基地台UE1之特別資源池或發送資源池中的現有D2D資源來和第二使用者裝置UE2進行D2D通訊。In step 250, the user device UE1 determines whether any condition in the resource selection criterion is satisfied. When any one of the conditions (6) to (7) in the resource selection criteria is satisfied, it means that the D2D resources provided by the current serving base station meet certain quality requirements. When any one of the conditions (8) to (9) in the resource scanning criterion is satisfied, it means that the serving base station can provide D2D resources with better quality than the neighboring target base station. Therefore, when any one of the conditions (6) to (9) in the resource selection criterion is satisfied, the user device UE1 will use the special resource pool of the first base station UE1 or the existing D2D resources in the sending resource pool in step 260 to sum up The second user device UE2 performs D2D communication.

當資源掃描準則中的條件(6)~(9)皆不成立時，代表鄰近目標基地台相較於目前服務基地台能提供品質較好的D2D資源。因此，此時使用者裝置UE1會在步驟270中使用第二基地台BS2提供之可用D2D資源來和第二使用者裝置UE2進行D2D通訊。When the conditions (6) to (9) in the resource scanning criterion are not satisfied, it means that the nearby target base station can provide D2D resources with better quality than the current serving base station. Therefore, at this time, the user device UE1 uses the available D2D resources provided by the second base station BS2 to perform D2D communication with the second user device UE2 in step 270.

在步驟280中，第一使用者裝置會依據3GPP規範中定義之基地台重選標準來判斷是否需要進行遞交。以第1圖所示之通訊系統100來說，當使用者裝置UE1判斷需要遞交時，會從第一基地台BS1遞交至第二基地台BS2，並依據第二基地台BS2之特別資源池或發送資源池來進行D2D通訊。In step 280, the first user device determines whether to submit according to the base station reselection criteria defined in the 3GPP specifications. For the communication system 100 shown in FIG. 1, when the user device UE1 determines that it needs to be submitted, it will be delivered from the first base station BS1 to the second base station BS2, and according to the special resource pool of the second base station BS2 or Send resource pool for D2D communication.

綜上所述，在本發明中，每一使用者裝置都會接收到相關於目前服務基地台和至少一鄰近目標基地台之點對點資訊，依據資源掃描準則來判斷鄰近目標基地台和目前服務基地台何者能提供品質較好的D2D資源，並依據資源選定準則來評估目前服務基地台所提供的D2D資源是否符合特定品質要求，再依此決定使用鄰近目標基地台或目前服務基地所提供之D2D資源來進行D2D通訊。因此，本發明可避免當先前技術在第二種D2D傳輸模式下運作時，在隨機選取資源池內可用資源的過程中無法維持D2D通訊服務連續性之問題。 以上所述僅為本發明之較佳實施例，凡依本發明申請專利範圍所做之均等變化與修飾，皆應屬本發明之涵蓋範圍。In summary, in the present invention, each user device receives point-to-point information related to the current serving base station and at least one neighboring target base station, and judges the neighboring target base station and the current serving base station according to the resource scanning criteria. Which one can provide D2D resources with better quality and evaluate whether the D2D resources provided by the current serving base station meet the specific quality requirements according to the resource selection criteria, and then decide to use the D2D resources provided by the nearby target base station or the current serving base. Perform D2D communication. Therefore, the present invention can avoid the problem that the D2D communication service continuity cannot be maintained during the process of randomly selecting available resources in the resource pool when the prior art operates in the second D2D transmission mode. The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the scope of patent application of the present invention shall fall within the scope of the present invention.

100‧‧‧通訊系統100‧‧‧communication system

BS1、BS2‧‧‧基地台BS1, BS2‧‧‧Base Station

UE1、UE2‧‧‧使用者裝置UE1, UE2‧‧‧user device

S1、S2‧‧‧覆蓋範圍S1, S2‧‧‧‧ Coverage

210~300‧‧‧步驟210 ~ 300‧‧‧step

第1圖為本發明支援點對點技術之通訊系統的功能方塊圖。 第2圖為本發明在通訊系統中進行點對點通訊之方法流程圖。FIG. 1 is a functional block diagram of a communication system supporting peer-to-peer technology according to the present invention. FIG. 2 is a flowchart of a method for performing point-to-point communication in a communication system according to the present invention.

Claims (14)

一種在一通訊系統中進行點對點通訊之方法，該通訊系統包含至少一第一使用者裝置、一第二使用者裝置、一第一基地台和一第二基地台，該方法包含： 該第一使用者裝置駐留在該第一基地台； 該第一基地台提供相關於該第一基地台和該第二基地台之點對點資訊給該第一使用者裝置，其中該點對點資訊至少包含該第一基地台之發送資源池(Tx resource pool)、該第一基地台之接收資源池(Rx resource pool)、該第一基地台之特別資源池(exceptional resource pool)、該第二基地台之發送資源池、該第二基地台之接收資源池，以及該第二基地台之特別資源池； 該第一使用者裝置依據該第一基地台所提供之一資源掃描準則來掃描該第二基地台之發送資源池、該第二基地台之接收資源池或該第二基地台之特別資源池以取得一可用點對點資源； 該第一使用者裝置依據該第一基地台所提供之一資源選定準則來選擇該第一基地台之特別資源池或該第一基地台之發送資源池中的一現有點對點資源來和該第二使用者裝置進行點對點通訊，或是選擇該可用點對點資源來和該第二使用者裝置進行點對點通訊。A method for point-to-point communication in a communication system. The communication system includes at least a first user device, a second user device, a first base station, and a second base station. The method includes: the first The user device resides on the first base station; the first base station provides point-to-point information related to the first base station and the second base station to the first user device, wherein the point-to-point information includes at least the first base station Tx resource pool of the base station, Rx resource pool of the first base station, exceptional resource pool of the first base station, and transmission resources of the second base station Pool, the receiving resource pool of the second base station, and the special resource pool of the second base station; the first user device scans the transmission of the second base station according to a resource scanning criterion provided by the first base station A resource pool, a receiving resource pool of the second base station, or a special resource pool of the second base station to obtain an available point-to-point resource; the first user device according to the first base A resource selection criterion provided by the base station to select a special resource pool of the first base station or an existing point-to-point resource in the sending resource pool of the first base station to perform point-to-point communication with the second user device, or select The available peer-to-peer resources can be used for peer-to-peer communication with the second user device. 如請求項1所述之方法，其中該資源掃描準則包含下列條件中至少其中之一： 該第一基地台之訊號強度低於一第一預定臨界值； 該第一基地台之品質低於一第一預定標準； 該第一基地台之訊號強度低於該第二基地台之訊號強度； 該第一基地台之品質低於該第二基地台之品質；以及 該第一使用者裝置從該第一基地台所接受到之一空中下載(over the air, OTA)訊息中包含一遞交(handover)指令。The method according to claim 1, wherein the resource scanning criterion includes at least one of the following conditions: the signal strength of the first base station is lower than a first predetermined threshold; the quality of the first base station is lower than one A first predetermined standard; the signal strength of the first base station is lower than the signal strength of the second base station; the quality of the first base station is lower than the quality of the second base station; An over the air (OTA) message received by the first base station includes a handover instruction. 如請求項1所述之方法，其中該第一使用者裝置係在該資源掃描準則中任一條件成立時掃描該第二基地台之發送資源池、該第二基地台之接收資源池或該第二基地台之特別資源池以取得該可用點對點資源。The method according to claim 1, wherein the first user device scans the sending resource pool of the second base station, the receiving resource pool of the second base station, or the second base station when any one of the conditions in the resource scanning criterion is satisfied. A special resource pool of the second base station to obtain the available point-to-point resources. 如請求項1所述之方法，其中該資源選定準則包含下列條件中至少其中之一： 該第一基地台之訊號強度高於一第二預定臨界值； 該第一基地台之品質高於一第二預定標準； 該第一基地台之訊號強度高於該第二基地台之訊號強度；以及 該第一基地台之品質高於該第二基地台之品質。The method according to claim 1, wherein the resource selection criterion includes at least one of the following conditions: the signal strength of the first base station is higher than a second predetermined threshold; the quality of the first base station is higher than one The second predetermined standard; the signal strength of the first base station is higher than the signal strength of the second base station; and the quality of the first base station is higher than the quality of the second base station. 如請求項4所述之方法，其中: 當該資源選定準則中任一條件成立時，該第一使用者裝置使用該第一基地台之特別資源池或該第一基地台之發送資源池中的一現有點對點資源來和該第二使用者裝置進行點對點通訊；且 當該資源選定準則中無任何條件成立時，該第一使用者裝置使用該可用點對點資源來和該第二使用者裝置進行點對點通訊。The method according to claim 4, wherein: when any condition in the resource selection criterion is satisfied, the first user device uses the special resource pool of the first base station or the sending resource pool of the first base station. An existing peer-to-peer resource to perform peer-to-peer communication with the second user device; and when none of the conditions in the resource selection criteria are met, the first user device uses the available peer-to-peer resource to perform a second user device Point-to-point communication. 如請求項1所述之方法，其另包含： 在該第一使用者裝置從該第一基地台遞交至該第二基地台之後，該第一使用者裝置使用該可用點對點資源來進行點對點通訊。The method according to claim 1, further comprising: after the first user device is delivered from the first base station to the second base station, the first user device uses the available point-to-point resources for point-to-point communication . 如請求項1所述之方法，其包含： 該第一基地台透過一系統訊息區塊(system information block, SIB)或一專門訊息(dedicated message)來發送該點對點資訊、該資源掃描準則或該資源選定準則至該第一使用者裝置。The method according to claim 1, comprising: the first base station sends the point-to-point information, the resource scanning criterion, or the system via a system information block (SIB) or a dedicated message Resource selection criteria to the first user device. 一種支援點對點通訊之一通訊系統，其包含： 一第一基地台和一第二基地台，該第一基地台用來提供相關於該第一基地台和該第二基地台之點對點資訊、一資源掃描準則，以及一資源選定準則，其中該點對點資訊至少包含該第一基地台之發送資源池、該第一基地台之接收資源池、該第一基地台之特別資源池、該第二基地台之發送資源池、該第二基地台之接收資源池，以及該第二基地台之特別資源池； 一第一使用者裝置和一第二基地台，該第一使用者裝置駐留在該第一基地台，且依據該資源掃描準則來掃描該第二基地台之發送資源池、該第二基地台之接收資源池或該第二基地台之特別資源池以取得一可用點對點資源，再依據該資源選定準則來選擇該第一基地台之特別資源池或該第一基地台之發送資源池中的一現有點對點資源來和該第二使用者裝置進行點對點通訊，或是選擇該可用點對點資源來和該第二使用者裝置進行點對點通訊。A communication system supporting point-to-point communication includes: a first base station and a second base station, the first base station is used to provide point-to-point information related to the first base station and the second base station, a A resource scanning criterion, and a resource selection criterion, wherein the point-to-point information includes at least a sending resource pool of the first base station, a receiving resource pool of the first base station, a special resource pool of the first base station, and the second base A sending resource pool of the station, a receiving resource pool of the second base station, and a special resource pool of the second base station; a first user device and a second base station, the first user device residing in the first A base station and scans the sending resource pool of the second base station, the receiving resource pool of the second base station, or the special resource pool of the second base station according to the resource scanning criterion to obtain an available point-to-point resource, and then The resource selection criterion selects a special resource pool of the first base station or an existing point-to-point resource in the sending resource pool of the first base station to match the second user device. Point communication line, or select the resources available point to point communication device and the second user. 如請求項8所述之通訊系統，其中該第一基地台所提供之該資源掃描準則包含下列條件中至少其中之一： 該第一基地台之訊號強度低於一第一預定臨界值； 該第一基地台之品質低於一第一預定標準； 該第一基地台之訊號強度低於該第二基地台之訊號強度； 該第一基地台之品質低於該第二基地台之品質；以及 該第一使用者裝置從該第一基地台所接受到之一空中下載訊息中包含一遞交指令。The communication system according to claim 8, wherein the resource scanning criterion provided by the first base station includes at least one of the following conditions: the signal strength of the first base station is lower than a first predetermined threshold; the first The quality of a base station is lower than a first predetermined standard; the signal strength of the first base station is lower than the signal strength of the second base station; the quality of the first base station is lower than the quality of the second base station; and An air download message received by the first user device from the first base station includes a submission instruction. 如請求項9所述之通訊系統，其中該第一使用者裝置係在該資源掃描準則中任一條件成立時掃描該第二基地台之發送資源池、該第二基地台之接收資源池或該第二基地台之特別資源池以取得該可用點對點資源。The communication system according to claim 9, wherein the first user device scans the sending resource pool of the second base station, the receiving resource pool of the second base station, or any one of the conditions in the resource scanning criterion, or A special resource pool of the second base station to obtain the available point-to-point resources. 如請求項8所述之通訊系統，其中該第一基地台所提供之該資源選定準則包含下列條件中至少其中之一： 該第一基地台之訊號強度高於一第二預定臨界值； 該第一基地台之品質高於一第二預定標準； 該第一基地台之訊號強度高於該第二基地台之訊號強度；以及 該第一基地台之品質高於該第二基地台之品質。The communication system according to claim 8, wherein the resource selection criterion provided by the first base station includes at least one of the following conditions: the signal strength of the first base station is higher than a second predetermined threshold; the first The quality of a base station is higher than a second predetermined standard; the signal strength of the first base station is higher than the signal strength of the second base station; and the quality of the first base station is higher than the quality of the second base station. 如請求項11所述之通訊系統，其中: 當該資源選定準則中任一條件成立時，該第一使用者裝置使用該第一基地台之特別資源池或該第一基地台之發送資源池中的一現有點對點資源來和該第二使用者裝置進行點對點通訊；且 當該資源選定準則中無任何條件成立時，該第一使用者裝置使用該可用點對點資源來和該第二使用者裝置進行點對點通訊。The communication system according to claim 11, wherein: when any one of the conditions of the resource selection criterion is satisfied, the first user device uses the special resource pool of the first base station or the sending resource pool of the first base station One of the existing peer-to-peer resources to perform peer-to-peer communication with the second user device; and when none of the conditions in the resource selection criteria are satisfied, the first user device uses the available peer-to-peer resources to communicate with the second user device Perform point-to-point communication. 如請求項8所述之通訊系統，其中該第一使用者裝置另用來在從該第一基地台遞交至該第二基地台之後，使用該可用點對點資源來進行點對點通訊。The communication system according to claim 8, wherein the first user device is further configured to perform the peer-to-peer communication using the available peer-to-peer resources after being delivered from the first base station to the second base station. 如請求項8所述之通訊系統，其中該第一基地台透過一系統訊息區塊或一專門訊息來發送該點對點資訊至該第一使用者裝置。The communication system according to claim 8, wherein the first base station sends the point-to-point information to the first user device through a system message block or a special message.
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