CN1316759C - Diversity shared transmission method between users of wireless communication system - Google Patents

Abstract

The invention relates to a diversity sharing transmission method among users of a wireless communication system, which relates to a method for receiving data by a mobile terminal. The method includes the following steps: a. establishing a diversity sharing transmission relationship between users among mobile terminals that want to receive the diversity sharing service among users, and reporting relevant information to the base station; b. performing information exchange between the base station and the mobile terminal, and determining the mobile terminal receiving the data And send data to the mobile terminal that is determined to receive the data; c. The mobile terminal receives the data transmitted by the base station and processes the received data; d. Establish a short-distance communication path between the mobile terminals, and transfer the data obtained by the mobile terminal to the other mobile terminals for diversity sharing. The invention enables users to obtain diversity gain through sharing, improves communication quality, reduces transmission power, can significantly improve communication quality, and at the same time reduces base station power consumption under the premise of maintaining the current number of users.

Description

Diversity sharing transmission method among users in a wireless communication system

technical field

The present invention relates to the communication field, in particular to a method for a mobile terminal to receive data in a wireless communication system.

technical background

The main business of the traditional wireless communication system is voice and narrowband data. The air interface adopts fixed modulation and coding methods, and may be supplemented by power control technology to adapt to the fading changes of the wireless channel. Moreover, the wireless terminal obtains contact with other wireless terminals or fixed terminals through communication with the base station (or some other wireless transceiver) on the network side. Mobile terminals generally do not directly communicate with each other without going through a network. For example, the typical second generation wireless communication system GSM, IS-95.

In the third-generation wireless communication systems CDMA2000 and WCDMA, high data rate transmission (HDR) technology with adaptive coding and modulation (AMC Adaptive Modulation and Coding) as the core has been used successively. , For packet data services with low real-time requirements, the mobile station measures the channel quality in real time, and determines the current modulation and coding method, that is, the instantaneous data transmission rate, according to the channel quality. If the channel condition is good, use high code rate coding and high order modulation to obtain a high transmission rate; if the current channel condition is poor, reduce the code rate and modulation order of the served users. In addition, the base station also allocates limited wireless resources to users with relatively good current channel conditions to obtain an increase in throughput.

However, the existing second-generation and third-generation wireless communication systems, such as GSM and WCDMA, have a large wireless propagation environment, and the distance between the base station and the mobile phone is far away. power to ensure signal quality.

In recent years, there have also been researches on distributed, self-organizing packet wireless networks (ad Hoc networks), which have no fixed network architecture, and mobile terminals themselves can function as base stations and routers, relying on self-organizing and self-adaptive network structures , the mobile terminals can directly communicate with each other. At present, there are also some short-distance wireless communication protocols, such as the Bluetooth (bluetooth) protocol already integrated in the mobile phone, the 802.11 protocol used in the wireless local area network (WLAN), and the like. These wireless communication methods all have the feature that terminals can directly communicate with each other without going through a fixed network.

But the wireless channel changes all the time. For one user, its signal quality is different at different times; for multiple users, their signal quality is also different at the same time.

The multiple-input multiple-output antenna (MIMO) technology currently being studied in wireless communication is to have multiple (N) antennas on the transmitting and receiving sides, and use spatial spread spectrum technology to modulate a channelization code and scrambling code pair into multiple different Data flow can theoretically increase peak capacity by N times. In this technology, the multi-antenna processing of the base station is relatively easy to implement, but there is no good practical solution for multi-antenna on the terminal side in terms of antenna arrangement and processing complexity.

Contents of the invention

The purpose of this patent is to propose a method for a mobile terminal to receive data through diversity sharing in a wireless communication system, thereby improving communication quality and system throughput.

A diversity sharing transmission method among users of a wireless communication system, characterized in that it comprises the following steps:

a. Establish an inter-user diversity sharing transmission relationship among mobile terminals that want to receive the inter-user diversity sharing service, and report relevant information to the base station;

b. Information exchange between the base station and the mobile terminal, determine the mobile terminal receiving the data and send data to the mobile terminal determined to receive the data;

c. The mobile terminal receives the data transmitted by the base station and processes the received data;

d. A short-distance communication path is established between the mobile terminals, and the data obtained by the mobile terminal is transmitted to other mobile terminals for diversity sharing.

In the step a, the relevant information refers to the diversity sharing transmission relationship protocol between users.

In the step a, the condition for establishing the inter-user diversity sharing transmission relationship between mobile users is that the path loss between mobile terminals meets the requirements for establishing a short-distance high-speed wireless data transmission relationship.

In step a, the process of establishing the diversity sharing transmission relationship between users is completed by the mobile terminal initiating a diversity sharing transmission request between users to the base station side, and the base station side obtaining information on other mobile terminals close to its location.

In the step a, the process of establishing a diversity sharing transmission relationship between users is to initiate a diversity sharing transmission request between the mobile terminals to the base station side when the mobile terminals determine that the mutual distance meets the requirements of the short-distance communication protocol. Completed.

In the step b, the content of information exchange between the base station and the mobile terminal is to report the current downlink channel quality through the mobile station, and the base station schedules the downlink channel resources according to the reported content, and determines the mobile terminal receiving the data.

The mobile terminal determined to receive data may be one mobile terminal or several mobile terminals.

In the step c, the mobile terminal processes the received data, including recovery, demodulation, channel decoding and buffering of the physical layer wireless baseband signal.

In the step d, the short-distance communication is a communication link established by Bluetooth technology.

In the step d, the short-distance communication is a communication link established by wireless local area network technology.

Due to the adoption of the transmission method of diversity sharing among users of the present invention, the diversity gain is obtained through sharing among users, which provides the possibility of realizing a variety of advanced wireless communication technologies, thereby improving communication quality and reducing transmission power, which can significantly improve communication quality , while reducing the power consumption of the base station while maintaining the current number of users.

Description of drawings

Fig. 1 is a network diagram of the diversity sharing transmission method of the present invention;

Fig. 2 is a flow chart of the present invention;

Fig. 3 is a flowchart of a process of establishing a diversity sharing relationship in the present invention;

Detailed ways

The specific implementation manners of the present invention will be described below in conjunction with the accompanying drawings.

As shown in FIG. 1 , it is a network schematic diagram of the diversity sharing transmission method of the present invention. It can be seen from the figure that the network environment of the present invention includes mobile terminals and base stations.

As shown in Figure 2, it is a flow chart of the transmission method of the present invention, as can be seen from the figure, the diversity sharing transmission method among users of the wireless communication system of the present invention comprises the following steps:

a. Establish an inter-user diversity sharing transmission relationship between mobile terminals that want to receive the inter-user diversity sharing service, and report the inter-user diversity sharing transmission relationship agreement to the base station;

Among them, the condition for establishing a diversity sharing transmission relationship between mobile users is that the path loss between mobile terminals is small, which meets the requirements for establishing a short-distance high-speed wireless data transmission relationship. For example, if a mobile terminal accesses through Bluetooth technology, then the mobile The distance between terminals must meet the distance requirements of the Bluetooth protocol. If the shared data is transmitted through a wireless LAN, it must meet the requirements of the wireless LAN protocol for the distance between terminals.

The mobile terminals that want to receive the diversity sharing service between users establish communication through the base station and reach an agreement, that is, they agree that these mobile terminals share the reception of the same information task issued by the base station to the mobile terminal, and inform the agreement Base station example. Generally speaking, the prerequisite for reaching an agreement is based on the trust between users of several terminals or that several terminals just have requirements for the same information task.

Among them, one of the ways to select two mobile terminals with a relatively short distance can be that one mobile terminal initiates a request to the base station, and the base station obtains the information of the mobile terminal close to its location through the mobile station positioning technology, as shown in Figure 3, that is A flow chart of establishing a diversity sharing relationship in this case;

The second way is that the users of the two mobile terminals determine that they are relatively close to each other and are willing to establish a diversity sharing relationship, so they actively report to the base station side. This situation is relatively common. For example, in the example mentioned later, colleagues in the office who have common data requirements are the simplest example. In the provision of business services, mobile terminals that have established a diversity sharing relationship are not required to have a common information requirement. As long as the users trust the two terminals, even if there is no common information requirement, they can also serve as diversity sharing users. At this time, a A terminal is equivalent to a transmission transfer station for another terminal;

In the above selection, the choice of distance can be determined according to the actual situation. Generally speaking, it only needs to meet the requirements of the short-distance communication protocol, such as being located inside the LAN, or a distance suitable for the WAP protocol.

The way to learn that users have common information needs can be based on the current negotiation between the two users, and report the negotiation result to the base station, or based on the base station's query of the user's pre-customized services. The base station finds that the two users have the same service needs, so through Diversity sharing mode provides services for these two users at the same time.

b. Information exchange between the base station and the mobile terminal, determine the mobile terminal receiving the data and send data to the mobile terminal determined to receive the data;

After the base station learns that the mobile station has established a diversity sharing user relationship for a specific information task, it also requires the mobile station to report the current downlink channel quality. The mobile stations measure the quality of their downlink channels and transmit them to the base station through the uplink wireless link. The base station schedules the downlink channel resources according to the reports of these mobile stations. The scheduling principle is to require the mobile stations with better channel quality to receive downlink data, so as to ensure that the work can support high data transmission under a relatively high signal-to-noise ratio. rate, thereby increasing system throughput. The idea of HDR technology is used for reference here, but in HDR, channel resources are competed but not shared among users.

The mobile terminal determined to receive data may be one mobile terminal or several mobile terminals.

Here, the base station may not select one of the better mobile stations to receive the downlink data, but several mobile terminals receive the downlink data. In this way, the diversity sharing mobile station is actually regarded as multiple receiving antennas, requiring these The mobile station simultaneously receives concurrent downlink data.

c. The mobile terminal receives the data transmitted by the base station and processes the received data;

Regardless of whether one mobile terminal receives downlink data or several mobile terminals receive downlink data, for a single mobile terminal participating in diversity sharing, in order to receive complete information tasks or obtain higher signal quality, part of the data received by itself must be is not enough. Therefore, each mobile station first performs preliminary processing on the data received by itself, including recovery, demodulation, channel decoding, buffering and so on of the wireless baseband signal at the physical layer.

d. A short-distance communication path is established between the mobile terminals, and the data obtained by the mobile terminal is transmitted to other mobile terminals for diversity sharing.

By directly establishing a high-quality short-distance communication path between terminals, these data can be quickly transferred to other mobile stations that are shared by diversity.

There are many ways to realize the above-mentioned short-distance communication: such as blue Tooth (Bluetooth) technology, WLAN (Wireless Local Area Network) technology, etc. The requirement for the terminal is to support the corresponding short-distance communication protocol at the same time.

For uplink data, a method similar to that for downlink can also be adopted, that is, the diversity sharing mobile stations first share uplink transmission information through short-distance wireless communication, and then share the communication with the base station.

Let's look at a specific example.

We assume that the mobile terminals of two colleagues (or family members, classmates, tour groups) of a certain company establish a diversity sharing relationship based on mutual trust, which are called a and b respectively. a. The reserved mobile Internet services include: stock information, video news; b. the reserved Internet services include: stock information, Life Weekly. The terminals of the two users can directly communicate with each other through the WLAN, and each terminal can also realize the connection with the public mobile communication network through signal transmission with the base station. Then, if you want to accept the diversity sharing transmission service of the present invention, you can proceed in the following manner:

Step 1: After going to work, the two colleagues confirm that the mobile terminals a and b are in close range, and the short-distance communication between them can be established.

Step 2: a sends a signal to the base station, requesting to establish diversity sharing with b.

Step 3: The base station processes the diversity sharing request of a, passes the request to b through the base station, and b responds with agreement.

Step 4: a and b can be regarded as having two antennas with independent channels relative to the same base station at this time. For any wireless Internet service scheduled by a or b, the high-level protocol converts it into a physical layer data stream suitable for wireless link transmission.

Step 5: When starting the process of transmitting the above data packets to terminals a and b, the base station notifies a and b through the wireless link, requiring them to feed back channel quality information to the base station through the uplink wireless link.

Step 6: Assume that the current business is stock information for both a and b. In time interval 1, the channel quality reported by a is better than that of b, which means that under the same transmit power of the base station, in the same time period, a can correctly receive more data than b, so the base station will be suitable for the size of A sends the physical layer data packet of the current channel quality, and requires a to receive it through signaling; in the next time interval, the channel condition of b is better than that of a, then the base station requires b to receive the next data packet...until the The business has been delivered. b In the process of data transmission, the received data is processed by radio frequency and baseband, and the original information flow is restored, and transmitted to a through the short-distance communication device and protocol WLAN between a and b, and a obtains it from the base station and b After all the information of the business has been summarized, the complete stock information is transmitted to b through the WLAN.

The cooperation between a and b can also be carried out in this way: the base station sends data, a and b receive it at the same time, b transmits the intermediate value of baseband processing (for example, the input likelihood ratio of channel decoding) to a through WLAN, and a sends the information Combined with the corresponding value processed by itself to obtain diversity reception gain and improve the reliability of wireless reception.

Step 7: Assume that the video information subscribed by a is to be transmitted, including high-definition graphics, animation, etc., and the amount of data is large. b can still share the transmission of the service with a in a similar manner to the sixth step, and finally, collect the complete information to a through short-distance communication, and b does not retain the service. Similarly, for the Life Weekly subscribed by b, a also shares the transmission, and collects the complete information at b.

In a word, whether it is a service required by both users or only one of them, both a and b have better channel conditions than those without diversity sharing, and can obtain faster and more convenient services with lower power consumption.

The present invention establishes diversity sharing for mobile users, so that users far away from the base station can obtain diversity gain through sharing, and provides the possibility of realizing various advanced wireless communication technologies, thereby improving communication quality, reducing transmission power, and significantly improving communication quality. At the same time, by encouraging diversity sharing, it can stimulate the consumption of user groups, serve more users with the same network coverage, or reduce the power consumption of base stations while maintaining the current number of users.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present invention can easily think of changes or Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (9)

1. A diversity sharing transmission method between users of a wireless communication system, characterized in that it comprises the following steps: a. Establish an inter-user diversity sharing transmission relationship between mobile terminals that want to receive the inter-user diversity sharing service, and report the inter-user diversity sharing transmission relationship agreement to the base station; b. Information exchange between the base station and the mobile terminal, determine the mobile terminal receiving the data and send data to the mobile terminal determined to receive the data; c. The mobile terminal receives the data transmitted by the base station and processes the received data; d. A short-distance communication path is established between the mobile terminals, and the data obtained by the mobile terminal is transmitted to other mobile terminals for diversity sharing. 2. The inter-user diversity sharing transmission method of the wireless communication system according to claim 1, characterized in that in said step a, the condition for establishing the inter-user diversity sharing transmission relationship between mobile users is the path loss between mobile terminals It meets the requirements for establishing a short-distance high-speed wireless data transmission relationship. 3. The method for diversity sharing transmission between users in a wireless communication system according to claim 2, characterized in that in step a, the process of establishing a diversity sharing transmission relationship between users is that the mobile terminal initiates the transmission between users to the base station side. The diversity sharing transmission request is completed by obtaining information of other mobile terminals close to the base station side. 4. The method for diversity sharing transmission among users of a wireless communication system according to claim 2, characterized in that in step a, the process of establishing a diversity sharing transmission relationship between users is to determine that the distance between mobile terminals meets the requirement of short distance When required by the communication protocol, it is accomplished by actively initiating a diversity sharing transmission request between the mobile terminals to the base station side. 5. The diversity sharing transmission method among users of a wireless communication system according to claim 1, characterized in that in said step b, the content of information exchange between the base station and the mobile terminal is reported by the mobile station to the current downlink channel quality, the base station schedules downlink channel resources according to the reported content, and determines the mobile terminal receiving the data. 6. The diversity sharing transmission method among users of a wireless communication system according to claim 5, characterized in that said mobile terminal that determines to receive data may be one mobile terminal or several mobile terminals. 7. The diversity sharing transmission method among users of the wireless communication system according to claim 1, characterized in that in the step c, the mobile terminal processes the received data, including the physical layer wireless baseband signal Recovery, demodulation, channel decoding, buffering. 8. The diversity sharing transmission method among users of a wireless communication system according to claim 1, characterized in that in said step d, said short-distance communication is a communication link established by Bluetooth technology. 9. The diversity sharing transmission method among users of a wireless communication system according to claim 1, characterized in that in said step d, said short-distance communication is a communication link established by wireless local area network technology.

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