Abstract:
Method and system for scheduling of a base station for HSUPA is provided. The method for scheduling of base station includes a method for scheduling of serving base station and a method for scheduling of non-serving base station, in which the method for scheduling of the serving base station comprises the base station generating a scheduling grant based on scheduling information SI and a happy bit transmitted from a terminal and based on a currently measured interference value, a configured threshold and associated resource information. The method for scheduling of the non serving base station comprises the base station generating a scheduling grant based on a currently measured interference value, a configured threshold and associated resource information. The system for scheduling of a base station comprises a transmitting module is used by the terminal for transmitting information to the base station; a configuration module is used by the SRNC for configuring parameters of associated threshold to the base station; a measurement module is used by the base station for measuring current interference; a calculation module is used by the base station for performing scheduling based on the current-obtained information. The present invention has solved the problem in scheduling of the base station for resources among terminals, which achieves the object of enhancing performance of uplink in a system and improving experience for users and has an important effect on HSUPA normalization process.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS  
       [0001]     This application is entitled to the benefit of Chinese Patent Application No. CN 200510023902.8 filed on Feb. 7, 2005 with the Chinese Patent Office.  
       FIELD OF THE INVENTION  
       [0002]     The present invention relates to 3G (the 3rd Generation) wireless mobile communication field, particularly to method and system for scheduling of base station for HSUPA.  
       PRIOR ART  
       [0003]     As an enhanced uplink technique of 3G, HSUPA is mainly used to enhance performance of uplink in a system and improve experience for users. In order to achieve the object, some new techniques are used in transmission of High Speed Uplink Packet Access (HSUPA), such as scheduling policy with Node B (Base Station) and etc., so that new processing and corresponding uplink and downlink signaling are introduced into the base station and the terminals to support the policy so as to achieve the object of enhancing uplink performance of system.  
         [0004]     In HSUPA, a basic process for scheduling of base station is: the base station generating and transmitting a downlink signal to the terminal based on associated uplink information, and the terminal performing correct data transmission based on a downlink scheduling signaling.  
         [0005]     In a HSUPA transmission process, the terminal reports its state to the base station according to a certain rule (e.g. in periodicity or event triggering mode), and transmits a happy bit for current occupied resources by the terminal on a signaling channel in each transmission period. Meanwhile, the base station makes measure for current interferences in each transmission period. Finally, the base station implements a scheduling process for resources among terminals based on the information.  
         [0006]     Uplink signaling of HSUPA associated with the scheduling process mainly includes:  
         [0007]     Scheduling Information (SI) transmitted in an Enhanced Dedicated Purpose Data Channel (E-DPDCH);  
         [0008]     Happy bit transmitted in an Enhanced Dedicated Purpose Control Channel (E-DPCCH) discussed at present;  
         [0009]     Downlink signaling associated with the scheduling process mainly includes:  
         [0010]     Absolute Grant (AG) for indicating upper limit of available resources for a terminal user;  
         [0011]     Relative Grant (RG) for adjusting user resources step by step.  
         [0012]     For a HSUPA transmission process in a SHO (Soft Hand-Over) state, there are the following provisions in 3GPP:  
         [0013]     SI is only transmitted to a serving base station;  
         [0014]     Transmission mode of SI can be in periodicity or event triggering mode;  
         [0015]     Scheduling grants generated by the serving base station include AG and RG;  
         [0016]     Non-serving base station only generates RG;  
         [0017]     AG is used for limiting upper limit of available resources for a terminal user;  
         [0018]     RG is applied to actual used resources of a user;  
         [0019]     RG of non-serving base station only relates to current interference  
         [0020]     The effects of AG of serving base station and RG of non-serving base station are the same, i.e. to be applied to actual usage for resources of a user.  
         [0021]     However, in order to implement a HSUPA transmission process, there exists the following important problems which can not be solved:  
         [0022]     1) How does the serving base station generate AG indicating upper limit of available resources for a user? 
         [0023]     2) How does the serving base station generate RG to be applied to actual usage for resources of a terminal user? 
         [0024]     3) How does the non-serving base station generate RG to be applied to actual usage for resources of a terminal user based on current interferences? 
         [0025]     4) What is relationship between scheduling process of base station and HARQ processing? 
         [0026]     A proper solution directed to the above problems is significant for optimizing HSUPA transmission and is necessary for normalization process of 3GPP HSUPA, but it is a problem to be solved how a base station performs scheduling for resources among terminals based on uplink information.  
         [0027]     The present invention is directed to corresponding solution to the above problems and has a significant effect on normalization process of HSUPA.  
       SUMMARY OF THE INVENTION  
       [0028]     The object of the present invention is to provide method and system for scheduling of base station for HSUPA in order to enhance performance of uplink in a system and improve experience for users.  
         [0029]     The present invention provides a method for scheduling of a serving base station for HSUPA, characterized in the base station generating a scheduling grant based on scheduling information SI and a happy bit transmitted from a terminal and based on a currently measured interference value, a configured threshold and associated resource information.  
         [0030]     In the above method for scheduling of a serving base station for HSUPA, when the serving base station receives the SI and the configured associated resource information is that no E-RGCH is configured for a cell, the generated scheduling grant is an Absolute Grant (AG).  
         [0031]     In the above method for scheduling of a serving base station for HSUPA, when the serving base station receives the SI and the configured associated resource information is that an E-RGCH is configured for a cell, the generated scheduling grant is one of an Absolute Grant (AG) and a Relative Grant (RG).  
         [0032]     In the above method for scheduling of a serving base station for HSUPA, when |E t |≧E, the serving base station generates an AG; otherwise, the serving base station generates a RG; wherein E is the parameter of the base station configured threshold, Et is the dynamic control variable, E t =T current −T target , T target  is the resources required for a user generated based on the SI, the interference, the happy bit of the terminal user, T current  is the current-used resources of the terminal user obtained from transmission format information.  
         [0033]     In the above method for scheduling of a serving base station for HSUPA, when the serving base station does not receive the SI and the configured associated resource information is that no E-RGCH is configured for a cell, the generated scheduling grant is an Absolute Grant (AG) or no scheduling grant is generated.  
         [0034]     In the above method for scheduling of a serving base station for HSUPA, when the serving base station does not receive the SI and the configured associated resource information is that an E-RGCH is configured for a cell, the generated scheduling grant is a RG.  
         [0035]     In the above method for scheduling of a serving base station for HSUPA, when information represented by the happy bit of the terminal user is inconsistent with the interference information of the serving base station, the priority of the interference information is higher than the information represented by the happy bit of the user.  
         [0036]     The present invention further provides a method for scheduling of a serving base station for HSUPA, characterized in the base station generating a scheduling grant based on scheduling information SI transmitted from a terminal and based on a currently measured interference value, a configured threshold and associated resource information.  
         [0037]     In the above method for scheduling of a serving base station for HSUPA, when the serving base station receives the SI and the configured associated resource information is that no E-RGCH is configured for a cell, the generated scheduling grant is an AG.  
         [0038]     In the above method for scheduling of a serving base station for HSUPA, when the serving base station receives the SI and the configured associated resource information is that an E-RGCH is configured for a cell, the generated scheduling grant is one of an AG and a RG.  
         [0039]     In the above method for scheduling of a serving base station for HSUPA, when |E t |≧E, the serving base station generates an AG; otherwise, the serving base station generates a RG; wherein E is the parameter of base station configured threshold, Et is the dynamic control variable, E t =T current −T target , T target  is the resources required for a user generated based on the SI and the interference, T current  is the current-used resources of the terminal user obtained from transmission format information.  
         [0040]     In the above method for scheduling of a serving base station for HSUPA, when the serving base station does not receive the SI and the configured associated resource information is that an E-RGCH is configured for a cell, the generated scheduling grant is a RG.  
         [0041]     The present invention further provides a method for scheduling of a non-serving base station for HSUPA, characterized in the base station generating a scheduling grant based on a currently measured interference value, a configured threshold and associated resource information.  
         [0042]     In the above method for scheduling of a serving base station for HSUPA, when the configured associated resource information is that no E-RGCH is configured for a cell, no scheduling grant is generated.  
         [0043]     In the above method for scheduling of a serving base station for HSUPA, when the configured associated resource information is that an E-RGCH is configured for a cell, the generated scheduling grant is a RG.  
         [0044]     The present invention further provides a system for scheduling of a base station for HSUPA, characterized in that the system comprises a transmitting module in a terminal, a configuration module in a SRNC and a measurement module and a calculation module in a base station, wherein the calculation module is connected to the transmitting module, the configuration module and the measurement module respectively, the transmitting module is used by the terminal for transmitting information to the base station; the configuration module is used by the SRNC for configuring parameters of associated threshold to the base station; the measurement module is used by the base station for measuring current interference; the calculation module is used by the base station for performing scheduling based on the current-obtained information.  
         [0045]     Using the above technical solution, i.e. by the method for generating Relative Grant RG S/N  proposed by the present invention, the Serving Radio Network Controller (SRNC) configures parameters of associated threshold based on current network status, the serving base station generates RG S  based on these parameters in combination with current interference and the happy bit of the terminal user, the non-serving base station generates RG N/S  based on these parameters and current interference, so that scheduling for resources among the terminals is implemented to achieve the object of enhancing performance of uplink in a system and improving experience for users and to have an important effect on HSUPA normalization process. 
     
    
     BRIEF DESCRIPTION OF DRAWINGS  
       [0046]      FIG. 1  is a structure schematic diagram of an apparatus for scheduling of base station of the present invention.  
         [0047]      FIG. 2  is one of the present invention, i.e. a method for scheduling of a serving base station.  
         [0048]      FIG. 3  is another one of the present invention, i.e. a method for scheduling of a non-serving base station. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0049]     To facilitate the following discussion, symbols are defined and used as follows: AG: Absolute Grant generated by a serving base station; RG S : Relative Grant generated by a serving base station; RG N : Relative Grant generated by a non-serving base station; ROT: Rise Over Noise (interference); SI: Scheduling Information.  
         [0050]     The present invention has proposed a complete solution of the existing base station scheduling for resources among terminal based on uplink information according to features of HSUPA and definitions to AG, RG S , RG N  in combination with associated decisions of 3GPP.  
         [0051]     I. For RG S    
         [0052]     (1) SI represents requirements for resources of a user, and the serving base station shall respond to the user on the requirements based on SI, so SI is a first one of mechanisms for triggering generation of RG S .  
         [0053]     (2) 3GPP has defined that RG S  is generated based on a current ROT of the base station, in consideration that RG N  and RG S  have the same function: to be applied to actual used resources by a terminal user. Therefore, a second one of mechanisms for generation of RG S  shall be based on a current ROT of the serving base station.  
         [0054]     (3) 3GPP RAN2 conference is discussing that 1 bit of Happy bit is transmitted on an E-DPCCH as a simple representation of happy level for current transmission resources of the terminal user at present. This bit information is transmitted on the E-DPCCH, so both the serving base station and the non-serving base station can receive the bit information. However, the non-serving base station only makes corresponding instructions based on current ROT, and the Relative scheduling Grant (RG N ) can only have a negative effect on resources available to the terminal user (RG N =DOWN/Don&#39;t Care). Also, there are two cases for processing for Happy Bit: the user is satisfied with current resources; the user is not satisfied with current resources. Therefore, the non-serving base station does not respond to the bit information, but the scheduling for the terminal by the serving base station contains two aspects, negative and positive:  
         [0055]     Positive response: transmitting a new AG to indicate a larger upper limit of resources or RG S =UP  
         [0056]     Negative response: transmitting a new AG to indicate a smaller upper limit of resources or RG S =DOWN/HOLD  
         [0057]     Therefore, if the Happy Bit is admitted by 3GPP, the serving base station responds to the bit information. Since information carried in 1 bit of Happy bit is limited, the serving base station can only generate a Relative Grant based on the bit information. That is, Happy Bit is a third one of mechanisms for generation of RG S .  
         [0058]     In addition, it only has an effect on transmission quality of a single user whether the terminal user is satisfied with current resources, and ROT will have a significant effect on transmission quality of all terminal users controlled by Node B. Therefore, if information represented by the Happy Bit of the terminal user is inconsistent with ROT information of the serving Node B, the priority of ROT will higher than that of information represented by the Happy Bit of the user.  
         [0059]     Summing up the above, three types of information shall be considered at the same time for generation of RG S :  
         [0060]     SI;  
         [0061]     ROT information of the serving base station;  
         [0062]     Happy bit information of UE;  
         [0063]     At the same time, it shall be considered that the transmission of SI is in periodically and event-triggered, i.e. Node B can not obtain SI information for all TTIs, and the ROT information and the Happy bit information exist for each TTI.  
         [0064]     II. For AG:  
         [0065]     3GPP has prescribed that Scheduling Information SI is transmitted to a serving base station in MAC-e packet according to requirement so that the serving base station performs scheduling on resources available to a terminal user. Since the SI contains much information and the serving base station can properly allocate resources among different users, the serving base station can generate an AG based on SI, current-measured interference information, Happy bit information of the terminal and etc.  
         [0066]     III. The Scheduling Process of Base Station is Divided into Scheduling Process of a Serving Base Station and Scheduling Process of a Non-Serving Base Station.  
         [0067]     III(A). The Scheduling Process of a Serving Base Station: Generation of AG, RG S    
         [0068]     3a.1 The Scheduling Process of a Serving Base Station Which Receives SI from a Terminal  
         [0069]     Referring to  FIG. 2 , scheduling information from the terminal is transmitted according to requirement, and interference measurement information ROT and Happy bit information from the terminal are available in each transmission period. For this feature, if the serving base station receives scheduling information from the terminal at a certain scheduling time, it properly allocates resources among users using a certain rule based on the SI, current ROT measurement information from each user and Happy bit from the terminal user to enhance performance of uplink in a system and improve experience for users.  
         [0070]     The serving base station generates different grants based on different configurations of cells.  
         [0071]     3a.11 The Case that no E-RGCH (Enhanced-Relative Grant Channel) is Configured for the Serving Cell  
         [0072]     SRNC make a determination whether it assigns E-RGCH for transmitting RG grant to the cell based on results of network planning, so there are some cells having E-RGCH and some having no E-RGCH configured, but it is certain that E-AGCH is configured. For this feature, if no E-RGCH is configured for the cell, the serving base station only generates AG based on SI, current ROT information and Happy bit of each UE (if the Happy bit information is admitted by 3GPP, the information is considered, otherwise it is not considered), which is transmitted to each terminal by E-AGCH.  
         [0073]     3a.12 The Case that E-RGCH Channel is Configured for the Serving Cell  
         [0074]     SRNC make a determination whether it assigns E-RGCH for transmitting RG grant to the cell based on results of network planning, so there are some cells having E-RGCH and some having no E-RGCH configured, but it is certain that E-AGCH is configured. For this feature, if an E-RGCH is configured for the cell, the serving base station switches between AG and RG S , generates and transmits one of AG and RG S  to the terminal through a corresponding channel based on a certain rule and corresponding scheduling information:  
         [0075]     if an AG is generated, it is transmitted to the terminal through an E-AGCH;  
         [0076]     if an RG S  is generated, it is transmitted to the terminal through an E-RGCH.  
         [0077]     In order to implement selection between AG and RG S , the SRNC configures a parameter of threshold E for the base station. The serving base station generated resources required for the user T target  based on the above SI, ROT, Happy bit information of the terminal user (if the Happy bit information is admitted by 3GPP, the information is considered, otherwise it is not considered) and etc, and obtains actual current-used resources of the terminal user by transmission format information. A dynamic control variable Et is defined as: 
 
 E   t   =T   current   −T   target  
 
 and then selection decision algorithm is as follows: 
 
         [0078]     if |E t |≧E then  
         [0079]     the serving base station generated AG and transmits it to UE through E-AGCH, else  
         [0080]     the serving base station generates RG and transmits it through E-RGCH end if  
         [0081]     wherein the parameter of threshold E can be reconfigured by SRNC.  
         [0082]     3a.2 The Case that the Serving Base Station does not Receive SI from the Terminal  
         [0083]     Referring to  FIG. 2 , scheduling information from the terminal is transmitted according to requirement, and interference measurement information ROT and Happy bit information from the terminal are available in each transmission period. For this feature, if the serving base station does not receive scheduling information from the terminal at a certain scheduling time, it generates different grants based on different configurations of cells.  
         [0084]     3a.21 The Case that no E-RGCH is Configured for the Serving Cell  
         [0085]     SRNC make a determination whether it assigns E-RGCH for transmitting RG grant to the cell based on results of network planning, so there are some cells having E-RGCH and some having no E-RGCH configured, but it is certain that E-AGCH is configured. For this feature, if no E-RGCH is configured for the cell and the scheduling process of the serving base station does not relate to the terminal, the serving base station does not generates any grants for the terminal, and if the scheduling process of the serving base station relates to the terminal, e.g. when resources for a certain terminal need to be decreased based on network status, the serving base station generates AG grant and transmits it to the terminal through the E-AGCH.  
         [0086]     3a.22 The Case that E-RGCH Channel is Configured for the Serving Cell  
         [0087]     SRNC make a determination whether it assigns E-RGCH for transmitting RG grant to the cell based on results of network planning, so there are some cells having E-RGCH and some having no E-RGCH configured, but it is certain that E-AGCH is configured. For this feature, if an E-RGCH is configured for the cell, the serving base station only generates RG S  based on ROT information and Happy bit information.  
         [0088]     There are two cases for generation of RG S  based on whether the Happy bit is admitted:  
         [0089]     3a.221; The Case without Happy Bit  
         [0090]     Since Happy bit is being discussed by HSUPA Normalization Organization at present, it will be determined whether representation of Happy bit is used according to results of discussion. For this feature, if Happy bit is not admitted by the normalization organization, the present invention defines that RG S  is generated based on current interference, according to function of the Relative Grant RG S  of the serving base station and referring to definition of the Relative Grant RG N  of the non-serving base station.  
         [0091]     The SRNC configures parameters of threshold for the serving base station. The serving base station make corresponding decisions based on current-measured interference and threshold.  
         [0092]     In n 1  successive transmission periods, if the interference measured by the serving base station is greater than Threshold  1 , the serving base station generates DOWN RG;  
         [0093]     In n 2  successive transmission periods, if the interference measured by the serving base station is less than Threshold  2 , the serving base station generates UP RG;  
         [0094]     In n 3  successive transmission periods, if the interference measured by the serving base station is between Threshold  1  and Threshold  2 , the serving base station generates HOLD RG;  
         [0095]     wherein the thresholds and n 1 , n 2 , n 3  is configured according to current network status, and can be reconfigured in a service transmission process.  
         [0096]     3a.222 The Case with Happy Bit  
         [0097]     Since Happy bit is being discussed by HSUPA Normalization Organization at present, it will be determined whether representation of Happy bit is used according to results of discussion. For this feature, if Happy bit is admitted by the normalization organization, since information carried in Happy bit is limited, it only has an effect on scheduling process of generating RG of the serving base station. Also, the Happy bit can only represent requirement for resources of a certain terminal user, and interference of the serving base station will have effects on transmission quality of all users controlled by the base station, so the priority of interference of the base station is higher than that of the Happy bit. Therefore, there is the following process of generating RG S :  
         [0098]     If the terminal user is satisfied with current occupation of resources,  
         [0099]     the serving base station generates RG scheduling grant according to process of 3a.221.  
         [0100]     If the terminal user is not satisfied current occupation of resources, if the interference measured by the serving base station is greater than Threshold  1  in n 1  successive transmission periods, the serving base station generates DOWN RG;  
         [0101]     if the interference measured by the serving base station is between Threshold  1  and Threshold  2 , the serving base station generates RG scheduling grant based on information represented by the Happy bit.  
         [0102]     III(B). The scheduling process of a non-serving base station: generation of RGN  
         [0103]     3b.1 The Case that no E-RGCH is Configured  
         [0104]     Referring to  FIG. 3 , the non-serving base station can only generates RG scheduling grant based on current interference. SRNC configures parameters of threshold for the non-serving base station based on current network status. SRNC make a determination whether it assigns E-RGCH for transmitting RG grant to the cell based on results of network planning, so there are some cells having E-RGCH and some having no E-RGCH configured, but it is certain that E-AGCH is configured. For this feature, if no E-RGCH is configured for the cell, the non-serving base station does not perform any processing.  
         [0105]     3b.2 The Case that E-RGCH Channel is Configured  
         [0106]     Referring to  FIG. 3 , the non-serving base station can only generates RG scheduling grant based on current interference. SRNC configures parameters of threshold for the non-serving base station based on current network status. SRNC make a determination whether it assigns E-RGCH for transmitting RG grant to the cell based on results of network planning, so there are some cells having E-RGCH and some having no E-RGCH configured, but it is certain that E-AGCH is configured. For this feature, if an E-RGCH is configured for the cell, the non-serving base station generates RGN based on current interference and these thresholds:  
         [0107]     in n 4  successive transmission periods, if the interference measured by the non-serving base station is greater than Threshold  4 , the non-serving base station generates DOWN RG;  
         [0108]     in n 5  successive transmission periods, if the interference measured by the non-serving base station is less than Threshold  5 , the serving base station generates HOLD RG  
         [0109]     These thresholds can be reconfigured in the transmission process.  
         [0110]     As shown in  FIG. 1 , the present invention provides a system for scheduling of a base station for HSUPA, comprising a transmitting module  10  in a terminal, a configuration module  20  in a SRNC and a measurement module  30  and a calculation module  40  in a base station, in which the calculation module  40  is connected to the transmitting module  10 , the configuration module  20  and the measurement module  30  respectively, the transmitting module  10  is used by the terminal for transmitting information to the base station; the configuration module  20  is used by the SRNC for configuring parameters of associated threshold to the base station; the measurement module  30  is used by the base station for measuring current interference; the calculation module  40  is used by the base station for performing scheduling based on the current-obtained information.  
         [0111]     The present invention proposes the following for the first time:  
         [0112]     The serving base station generates AG or RG S  based on SI, ROT, and Happy bit from a terminal user.  
         [0113]     If SI information is not received and Happy bit is not admitted, it is proposed that RG S  is based on interference of a serving base station.  
         [0114]     If SI information is not received and Happy bit is admitted by 3GPP, only the serving base station performs processing on the Happy bit, which only has a effect on RG S . That is, the serving base station generates a proper RG based on current interference and information carried in the Happy bit. If the current interference of the base station is inconsistent with information represented by the Happy bit, the priority of the interference is regarded as being higher, i.e. RG S  is associated with the interference of the serving base station and the Happy bit information.  
         [0115]     The present invention proposes a method for generating Relative Grant RG S/N : SRNC configures associated parameters of threshold, the serving base station generates RG S  based on these parameters in combination with current interference and Happy bit information of a terminal user, and the non-serving base station generates RG N/S  based on these parameters of threshold and current interference.  
         [0116]     The above embodiments of the present invention have been presented by way of example only, and not limitation. It should be noted that various changes and modifications could be made by those skilled in the art herein without departing from the sprit and scope of the invention. Therefore, all equivalent technical solutions should belong to the scope of the present invention which should be limited by the attached claims.