Abstract:
Disclosed are a system and a method for managing quality of service (QoS) of a mobile terminal. A wireless quality management unit is able to read QoS parameters and data from a wireless communication protocol unit and reports the same to a man machine interface (MMI) unit or upper layer unit so as to provide QoS services subsequently. The invention enables a user or upper layer software to effectively, efficiently, and flexibly utilize wireless interface communication.

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates to the technical field of Quality of Service (QoS) management in wireless communication and, more particularly, to a system and a method for managing QoS of a mobile terminal. 
   2. Description of Related Art 
   Conventionally, the software of a mobile terminal cannot report QoS or related measurement data of wireless interface communication software. Furthermore, the mobile terminal is unable to manage or monitor QoS of the wireless interface communication software. Instead, QoS used by the wireless interface communication software must be sent to the network and then sent back to the mobile terminal, so that an upper layer (e.g., application layer) can obtain the actual QoS. In view of the above, the upper layer cannot know wireless communication resource in real time, resulting in an inefficiency due to retransmission, a low data transfer rate, or the like. Moreover, the user cannot change settings of the wireless interface communication software even there is a need. In other words, the setting of the wireless interface communication software is unchangeable, resulting in a lack of flexibility. 
   Therefore, it is desirable to provide a novel system and method for managing QoS of a mobile terminal in order to mitigate and/or obviate the aforementioned problems. 
   SUMMARY OF THE INVENTION 
   The object of the present invention is to provide a system and a method for managing quality of service of a mobile terminal so as to enable a user or upper layer software to effectively, efficiently, and flexibly utilize wireless interface communication. 
   In one aspect of the present invention there is provided a system for managing quality of service (QoS) of a mobile terminal, which comprises: a man machine interface (MMI) unit for operating the mobile terminal; an upper layer unit coupled to the MMI unit for supporting at least one network protocol; a wireless communication protocol unit for supporting at least one QoS service to obtain QoS parameters and data; and a wireless quality management (WQM) unit coupled to the wireless communication protocol unit, the MMI unit, and the upper layer unit respectively for receiving the QoS parameters and data and sending the same to the MMI unit or the upper layer unit in real time, so as to process the at least one QoS service. 
   In another aspect of the present invention, there is provided a method for managing QoS of a mobile terminal, which comprises the steps of: (A) sending a QoS request to a network for requesting the network to provide a first QoS; (B) if the network can not provide the first QoS, performing a channel analysis by a second QoS evaluated and set by the network for obtaining a channel analysis result and executing step (D); (C) if the network can provide the first QoS, the mobile terminal performing the channel analysis based on a wireless interface channel configuration corresponding to the first QoS for obtaining a channel analysis result; and (D) entering into a QoS management state until an end of service request is received. 
   Other objects, advantages, and novel features of the invention will become more apparent from the detailed description when taken in conjunction with the accompanying drawings. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is a block diagram of a system for managing QoS of a mobile terminal according to the present invention; and 
       FIG. 2  is a flowchart showing a method for managing QoS of a mobile terminal according to the present invention. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
   With reference to  FIG. 1 , there is shown a system constructed in accordance with the invention comprising a mobile terminal  1 , a wireless access network  2 , and a core network (CN)  3 . The mobile terminal  1  includes a wireless communication protocol unit  11 , a man machine interface (MMI) unit  12 , an upper layer unit  13 , and a wireless quality management (WQM) unit  14 . The wireless communication protocol unit  11  includes a non-access stratum (NAS)  111  and an access stratum (AS)  112 . 
   In this embodiment, the upper layer unit  13  is an upper layer software for supporting at least one network protocol such as Transmission Management Protocol (TCP), User Datagram Protocol (UDP), Simple Mail Transfer Protocol (SMTP), File Transfer Protocol (FTP), or Internet Protocol (IP). The wireless communication protocol unit  11  supports at least one wireless communication protocol and is able to set wireless communication channels and transmission modes. Furthermore, the wireless communication protocol unit  11  is able to manage routes and user identifications and help the upper layer unit  13  to provide services. 
   The WQM unit  14  is coupled to the wireless communication protocol unit  11 , the MMI unit  12 , and the upper layer unit  13  respectively. Hence, the WQM unit  14  is able to request the AS  112  to report QoS parameters and measuring data of a wireless interface communication software to the WQM unit  14 . Also, the WQM unit  14  can request the NAS  111  to report QoS parameters and measuring data of the NAS  111 . The upper layer unit  13  or the MMI unit  12  may set the NAS  111  via the WQM unit  14 . As a result, the purpose of enabling a user or upper layer software to effectively, efficiently, and flexibly utilize wireless interface communication can be achieved. 
   Because formats regarding the representation of QoS may be different among these layers, the WQM unit  14  is implemented as a fuzzy or neural network for comparing QoS of one layer with that of the other layer. 
   With reference to  FIG. 2 , there is shown a flowchart showing a sequence of steps performed by the system. In step S 201 , the upper layer unit  13  or the MMI unit  12  may submit a QoS request (Qr) to the WQM unit  14 . The Qr is then sent from the WQM unit  14  to the NAS  111  and the NAS  31  of the CN  3  respectively. Next, the CN  3  inquires the wireless access network  2  whether to provide QoS to the mobile terminal  1 . 
   If the wireless access network  2  cannot achieve the QoS request (for example, the provided transmission rate is lower than Qr), the CN  3  informs the NAS  111  about a QoS setting (Qs) evaluated by the CN  3 . The wireless access network  2  then configures the AS  112  by using Qs in order to obtain a configured QoS setting (Qc) equal to Qs. Note that Qs is a representation of QoS of NAS while Qc is a representation of QoS of AS. The AS  112  reports Qc to the WQM unit  14  (step S 202 ). Then, the process goes to the QoS management step (step S 204 ). 
   If the wireless access network  2  can achieve the QoS request, the wireless access network  2  maps Qr to a corresponding wireless interface channel configuration which is further analyzed by the AS  112  of the mobile terminal  1 . An analysis result is reported to the CN  3 . Next, the CN  3  sends the QoS request to the NAS  111 . The NAS  111  then notifies the MMI unit  12  or the upper layer unit  13  of the QoS result by, for example, showing on the display of a cellular phone. Also, the NAS  111  will notify the WQM unit  14  of the QoS result (step S 203 ). Then, the process goes to the QoS management step (step S 204 ). 
   In step S 204 , the AS  112  analyzes the wireless interface channel configuration for reporting associated parameters or measured data to the WQM unit  14 . For example, the AS  112  reports an actual QoS (Qm) (step S 205 ). If the WQM unit  14  finds that Qm is larger than Qc but smaller than or equal to Qr, the WQM unit  14  will submit a request about changing QoS to the NAS  111  in order to obtain an improved QoS (step S 206 ). 
   Alternatively, if Qm is smaller than Qc, the WQM unit  14  will report the current Qm to the MMI unit  12  or the upper layer unit  13  in which the current Qm is poorer than Qc. As such, it is possible of informing user of modifying the requested QoS to a lower one (step S 207 ). 
   If Qm is larger than Qc and Qr, the WQM unit  14  will take Qr to modify QoS. That is, the user can request a QoS better than Qr to the CN  3  via the MMI unit  12  or the upper layer unit  13  (step S 208 ). 
   Moreover, in the QoS management step, the user may set a new QoS request (Qr′) via the MMI unit  12  or the upper layer unit  13 . The Qr′ is then sent to the WQM unit  14  (step S 209 ). The WQM unit  14  will compare Qm (obtained by the AS  112 ) with Qr′ for determining whether Qm is larger than Qr′. If Qm larger than or equal to Qr′, the WQM unit  14  will request the NAS  111  for modifying QoS based on Qr′ (step S 210 ). 
   Alternatively, if Qm is smaller than Qr′, the WQM unit  14  will report the current Qm to the MMI unit  12  or the upper layer unit  13  in which the current Qm is poorer than Qr′. As such, it is possible of informing user of modifying the requested QoS to a lower one (step S 211 ). The process will return to step S 204  for looping after performing one or more steps of the steps from S 206  to S 211  until an end of service request is received from the WQM unit  14  (step S 212 ). 
   Although the present invention has been explained in relation to its preferred embodiment, it is to be understood that many other possible modifications and variations can be made without departing from the spirit and scope of the invention as hereinafter claimed.