Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W28/00—Network traffic management; Network resource management
  • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W72/00—Local resource management
  • H04W72/20—Control channels or signalling for resource management
  • H04W72/29—Control channels or signalling for resource management between an access point and the access point controlling device

Definitions

• the present invention discloses a scheduling method and device for use in a cellular wireless system.
• EUL Enhanced UpLink techniques
• the controlling node of the cell the so called NodeB
• EUL resources such as, for example, codes, transmission timeslots and transmission frequencies to the EUL users in the cell with a predefined regularity.
• the EUL resources which are allocated by the NodeB are in turn allocated to the NodeB by another node in the system a so called RNC, Radio Network Controller.
• the RNC allocates a "pool" of EUL resources to the NodeB, which then allocates these resources among the UEs in the cell which use EUL.
• the EUL resources in a TD SCDMA system can thus be viewed as "shared resources", since the NodeB allocates them between different users at regular intervals.
• Most TD SCDMA systems will also comprise resources such as, for example, codes, which are dedicated, i.e. "per user” resources, which cannot be re-allocated with the same ease as the shared resources.
• the total amount of resources i.e. the sum of the dedicated and shared resources, is usually limited in an EUL enabled TD SCDMA system, so the
• RNC needs to be able to optimize its decision on which resource should be allocated as shared resources, since this will directly affect the amount of resources that can be used as dedicated resources.
• Such a solution is offered by the present invention in that it discloses a method for use in a cellular wireless system.
• use is made of at least a first controlling node, a NodeB, for a first cell in the system, and EUL, Enhanced UpLink, is enabled for at least some users, UEs. in the first cell.
• the method of the invention also uses an RNC, a Radio Network Controller, in order to allocate uplink resources to the NodeB as a shared resource pool, and the NodeB allocates resources from this shared resource pool to UEs in the cell of the NodeB.
• RNC Radio Network Controller
• the NodeB is enabled to detect if its shared resource pool should be altered in size with respect to any one of the parameters in the pool; the NodeB is enabled to, in such a case, inform the RNC of this, and the RNC then carries out such an alteration.
• the invention is suitable for use in a cellular system of the TD SCDMA kind, Time Division Synchronous Code Division Multiple Access, but can also be used in other cellular systems.
• the shared resource pool can comprise various parameters, but in one embodiment the shared resource pool comprises at least one of the following parameters:
• the invention also discloses a controlling node in a system in which the invention is applied, as well as an RNC for use in such a system
• Fig 1 shows a schematic view of a system in which the invention can be applied
• Fig 2 shows a prior art principle
• Fig 3 shows a principle used by the invention
• Figs 4a and 4b show a schematic flow chart of a method of the invention
• Fig 5 shows a block diagram of a controlling node of the invention
• Fig 6 shows a block diagram of an RNC of the invention.
• Fig 1 shows a schematic view of a cellular system 100 in which the invention is applied.
• the system 100 comprises at least one cell 110, with a controlling node, a so called NodeB, 130, which has as one of its functions to control traffic to and from users, "UE"s, 120, in the cell.
• a NodeB is also shown in step 410 of fig 4a. Steps which are options or alternatives in figs 4a and 4b are indicated with dashed lines.
• the system 100 also comprises a so called RNC node 140, a node for Radio Network Control, as is also indicated in step 420 of fig 4a.
• RNC node 140 a node for Radio Network Control
• Some of the UEs in the cell 110 may be enabled for so called EUL, Enhanced Uplink, as indicated in step 415 of fig 4a.
• the resources used for the EUL enabled UEs in a cell are allocated by the RNC 140 to the NodeB 130 of the cell as a pool of shared resources, i.e. an amount of resources which are then allocated, step 435, by the NodeB to the individual UEs in the cell.
• the allocation of resources is done by the NodeB every so called TTI, Transmission Time Interval, using a number of factors such as, for example inter cell and intra cell RoT, Rise over Thermal, which is an indication of the thermal noise, as measured by the NodeB.
• Other factors which can be used are the buffer occupation in the UEs and the transmit power capacity in the UEs.
• the pool of shared resources can comprise various resources, but examples of such resources, at least one of which will be included according to the invention are spreading codes, transmission time slots and transmission frequencies, as shown in step 430.
• an objective of the present invention is to enable more efficient and more optimized decisions on the part of the RNC 140 regarding the size of the resource pool allotted to the NodeB.
• One of the reasons for this is the fact that other services apart from the EUL services use dedicated resources, which means that resources which are not used by the RNC for the EUL shared resource pool can be used by the RNC for such dedicated services instead.
• the NodeB will according to the present invention, detect, step 430, if its shared resource pool should be altered in size with respect to any one of the parameters in the pool, and if that is the case, the NodeB will inform, step 450. the RNC of this, so that the RNC may carry out such an alteration, step 457.
• the NodeB detects if the shared resource pool should be altered by means of monitoring, step 445, a number of parameters, and seeing if one or more of these parameters exceed a first threshold, T1 , which means that the pool should be increased, or if one or more of these parameters falls below a second threshold, T2, which means that the pool should be made smaller. It is possible to have only one upper and one lower threshold for all of the parameters, or one upper and one lower threshold per parameter, or any combination of these versions, i.e. any number of parameters may be "lumped together" for comparison with one threshold.
• the parameters which are monitored by the NodeB may vary between different applications and different installations, but as shown in step 405.
• the invention is suitably applied in a TD SCDMA system, in which case examples of suitable parameters which are used are the following:
• the interference situation which is detected by the NodeB by means of measuring the Received Total Wideband Power. RTWP and/or the Interference Signal Code Power ISCP.
• the UE power headroom may be monitored by the NodeB since the UEs report their remaining headroom to the NodeB.
• NBAP is an abbreviation of "NodeB Application Part", which is the lub interface (i.e. the interface between the NodeB and the RNC) signalling.
• the NBAP message in question may be an existing NBAP message, or a new NBAP message which is created for this purpose.
• the RNC When the RNC is informed by the NodeB of a need for an alteration in the shared EUL resource pool, the RNC will suitably use an NBAP message, step 465, in order to inform the NodeB of such an alteration in the shared EUL resource pool.
• An NBAP message which may be used by the RNC for this purpose is the NBAP message "Physical Shared Channel Reconfiguration ", as shown in step 470. i.e. "PSCR".
• the method of the invention can be implemented in a number of ways, either as hardware or software, or as a combination of hardware and software.
• the software may suitably be implemented as computer executable code, stored on a computer readable storage media, such as hard drives, disc drives, tape etc.
• Fig 5 shows a schematic block diagram of a controlling node 500 in a system in which the invention is applied. As indicated in fig 5, the controlling node
• controlling node 500 will comprise an antenna, shown as block 510, and will also comprise a receive part 520 and a transmit part 530.
• the controlling node 500 also comprises a control means 540 such as a micro processor, as well as a memory 550.
• the controlling node 500 also comprises an interface 560 towards other components in the system apart from the UEs. such as, for example, an RNC.
• controlling node 500 Since the major components of the controlling node 500 have now been introduced, these components may now be referred to by their reference numbers alone, e.g. "the means 510 " instead of the antenna 510.
• the controlling node is intended for use as a controlling node in a cell of a cellular wireless system in which cell EUL, Enhanced UpLink, is enabled for at least some of the users, "UEs", in the cell.
• the controlling node 500 uses the controller 540, the memory 550 and the RNC interface 560 for communicating with an RNC, a Radio Network Controller, in the system, and for receiving allocations from the RNC for uplink resources as a shared resource pool.
• controlling node 500 also uses the 540, 550. 530 and 510 for allocating resources from the shared resource pool to the UEs in the cell, and the controlling node 500 uses the controller 540 and the memory 550 for detecting if its shared resource pool should be altered in size with respect to any one of the parameters in the pool, and in such a case, uses the controller 540 and the RNC interface 560 for informing the RNC of this, and also for receiving instructions from the RNC for such an alteration.
• the shared resource pool comprises at least one of the following parameters:
• the controlling node 500 is a NodeB in a cellular wireless system of the TD SCDMA kind, Time Division Synchronous Code Division Multiple Access.
• the controlling node 500 uses the controller 540, the memory 550 and the RNC interface 560 for informing the RNC of a necessary alteration by means of an NBAP message,
• controlling node 500 may use the means 540 and 560 for receiving an NBAP message from the RNC with information of an alteration in the shared resource pool.
• the NBAP message from the RNC 140 is the NBAP message "Physical Shared Channel
• the controlling node 500 uses the means 510, 520, 540 and 550 for detecting if its shared resource pool should be altered by means of monitoring a number of parameters to see if the parameter exceeds a first threshold, T1. thus indicating a need for an increase, or falls below a second threshold, T2, thus indicating a need for a decrease.
• the parameters which are monitored include at least one of the following:
• the invention also discloses a Radio Network Controller, as shown in fig 6.
• the inventive RNC is intended for use in a cellular wireless system in which system EUL, Enhanced UpLink, is enabled for at least some of the users, "UEs”.
• the RNC 600 is equipped with means 610 for communicating with at least a first controlling node of the system and also with means 620 for allocating to said controlling node uplink resources as a shared resource pool.
• the means 610 can suitably include an interface, as well as a "communication controller", such as, for example, a micro processor 611 in combination with a memory 612.
• the interface is suitably a land line interface, although a radio interface is also possible.
• the RNC 600 also uses the means 610 for communication for receiving information from the first controlling node that the node ' s shared resource pool should be altered in size with respect to any one of the parameters in the pool, and the allocation means 620 will in such cases be used for making such an alteration, including informing the controlling node of the alteration, suitably via the communication means 610..
• the shared resource pool comprises at least one of the following parameters:
• the Radio Network Controller 600 is an RNC for a cellular wireless system of the TD SCDMA kind, Time Division Synchronous Code Division Multiple Access.
• the RNC uses the means 610 for receiving information from the first controlling node of a necessary alteration by means of an NBAP message, NodeB Application Part.
• the RNC 600 uses the means 610 for transmitting an NBAP message to a controlling node with information of an alteration in the shared resource pool, suitably the NBAP message "Physical Shared Channel Reconfiguration".

Landscapes

• Engineering & Computer Science (AREA)
• Quality & Reliability (AREA)
• Computer Networks & Wireless Communication (AREA)
• Signal Processing (AREA)
• Mobile Radio Communication Systems (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (2)

Family

ID=40512043

Family Applications (1)

Country Status (2)

Cited By (3)

Families Citing this family (1)

Citations (8)

Family Cites Families (1)

• 2008
  • 2008-06-17 CN CN200880108296.1A patent/CN101803421B/zh not_active Expired - Fee Related
  • 2008-06-17 WO PCT/SE2008/050720 patent/WO2009041882A2/en active Application Filing

Patent Citations (8)

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events