WO2009070094A1 - Ru assignment in td-scdma eul - Google Patents

Ru assignment in td-scdma eul Download PDF

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Publication number
WO2009070094A1
WO2009070094A1 PCT/SE2008/051100 SE2008051100W WO2009070094A1 WO 2009070094 A1 WO2009070094 A1 WO 2009070094A1 SE 2008051100 W SE2008051100 W SE 2008051100W WO 2009070094 A1 WO2009070094 A1 WO 2009070094A1
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WO
WIPO (PCT)
Prior art keywords
nodeb
scheduled
message
rnc
transmissions
Prior art date
Application number
PCT/SE2008/051100
Other languages
French (fr)
Inventor
Jie Mao
Jiuhui Du
Bin Xu
Original Assignee
Telefonaktiebolaget L M Ericsson (Publ)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget L M Ericsson (Publ) filed Critical Telefonaktiebolaget L M Ericsson (Publ)
Priority to CN200880117332A priority Critical patent/CN101868995A/en
Publication of WO2009070094A1 publication Critical patent/WO2009070094A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/50—Queue scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/02—Hybrid access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/12—Access point controller devices

Definitions

  • the present invention discloses a method for use in a TD-SCDMA system which uses EUL technology, in which system there is a number of terminals, UEs, in a cell in the system, with a NodeB which serves to control the traffic to and from the UEs in a cell, the system also comprising a Radio Network Controller.
  • EUL, Enhanced Uplink, or HSUPA 1 High Speed Uplink Packet Access is a 3G (third generation) mobile communication evolution technology which is used to optimize the radio resource utilization for packet services in uplink, i.e. in transmissions from users, UEs, in a cell to the controlling node of the cell, the NodeB.
  • EUL is standardized, for example for the TD-SCDMA system, Time Division Synchronous Code Division Multiple Access.
  • the abbreviation TD EUL is here used for TD- SCDMA systems in which EUL is enabled.
  • EUL is sometimes also referred to as HSUPA, High Speed Uplink Packet Access.
  • N-carrier techniques are standardized as a TD- SCDMA specific multiple frequency (i.e. using N carrier frequencies) technology for improving the system capacity and for optimizing the power utilization/coverage balance between common (i.e. shared) timeslots and traffic timeslots in TD-SCDMA.
  • RRM Radio Resource Management
  • 3G 3G and in other mobile cellular systems in order to optimize the handling of the available radio resource units, RUs, as effectively as possible.
  • N-carrier TD EUL when a connection to a UE is set up, either initially or as a reconfiguration, a control channel is established between the UE and the RNC, the Radio Network Controller, via the NodeB, to carry control signalling, and when/if the UE subsequently needs to make data transmissions, the network, i.e.
  • the RNC will try to find a suitable frequency band which is assigned to TD EUL services and which can be used for those data transmissions, the word "suitable” here being used with respect to such factors as radio propagation and radio resources in use on each of the available frequency bands.
  • the procedure for EUL data transmissions for a UE is that when a UE requests an EUL session, the NodeB selects and recommends a frequency for the EUL traffic, and sends this recommendation to the RNC, the Radio Node Controller. The RNC then decides if this frequency or some other frequency should be used for the EUL session for the UE in question.
  • the scheduled transmissions are data transmissions and are scheduled by the NodeB per TTI, Transmission Time Interval, while the non-scheduled transmissions are control signal transmissions which are controlled by the RNC.
  • EUL data transmissions can only be made from a UE on one carrier at a time, which means that the control channel signalling and the data transmission channel need to work on the same frequency.
  • This purpose is achieved by the present invention in that it discloses a method for use in a TD-SCDMA system which uses EUL technology, according to which method: • a number of terminals, UEs, are used in a cell in the system,
  • a controlling node serves to control traffic to and from UEs in the cell
  • the system comprises an RNC, a Radio Network Controller, • the scheduled transmissions are controlled by the NodeB,
  • either the RNC and/or the NodeB monitors if the scheduled and non-scheduled transmissions are scheduled to take place on different frequencies or not.
  • the NodeB monitors if the scheduled and non-scheduled transmissions are scheduled to take place on different frequencies or not, and the NodeB notices that this is the case, the NodeB sends a message to the RNC requesting that the non-scheduled transmission be moved to the same frequency as the scheduled transmission. The request is carried out by the RNC, so that both transmissions will be carried out on one and the same frequency.
  • the message from the NodeB to the RNC is sent as an information element, an IE, in the message "Radio Link Reconfiguration Ready", and it is also possible to let the RNC confirm the move of the transmission by means of the message "Radio Link Reconfiguration Commit" to the NodeB.
  • the NodeB monitors if the scheduled and non-scheduled transmissions are planned to take place on different frequencies or not, and if that is so, the NodeB reschedules its scheduled transmissions to take place on the same frequency as the non-scheduled transmissions.
  • Fig 1 shows a basic view of a system in which the invention may be used
  • Fig 2 and 3 show examples of the invention, and Fig 4 shows a flow chart of the inventive method, and Fig 5 shows a block diagram of a NodeB of the invention.
  • Fig 1 shows a schematic view of a system 100 in which the invention may be applied.
  • the system 100 is a so called TD-SCDMA system, Time Division Synchronous Code Division Multiple Access, and, as shown in fig 1 , the system 100 comprises a number of cells, one of which is shown as 110 in fig 1.
  • the system 100 comprises a number of cells, one of which is shown as 110 in fig 1.
  • UEs "User Equipment”
  • each cell will also comprise a controlling node, a so called NodeB, shown as 130 in fig 1 , which serves, inter alia, to control the traffic to and from the UEs in the cell.
  • NodeB so called NodeB
  • the system will also comprise at least one so called Radio Network Controller, an RNC, 140 in fig 1 , which has as one of its functions to control the radio resource units, the RUs, of NodeBs which are attached to the RNC.
  • RNC Radio Network Controller
  • RUs are frequency carriers, time slots and so called channelization codes
  • EUL Enhanced UpLink
  • HSUPA High Speed Uplink Packet Access
  • the system 100 is a so called N-carrier TD-SCDMA EUL system, the so called “N carrier” technique being a TD-SCDMA specific multiple frequency (“N carrier”) technology which improves the system capacity and optimizes the balance between power utilization and coverage.
  • N carrier TD-SCDMA specific multiple frequency
  • a purpose of the present invention to improve the frequency allocation of the so called scheduled and non-scheduled transmissions in a TD-SCDMA EUL system such as the one 100 in fig 1.
  • the non-scheduled transmissions are control channel transmissions to/from the UE, while the scheduled transmissions are data transmissions to/from the UE.
  • the non-scheduled transmissions are planned in frequency by the RNC, while the scheduled transmissions are planned in frequency by the NodeB.
  • the UE can only transit on one frequency at a time, which means that problems will arise if the control transmissions and the data transmissions are planned to take place on different frequencies. Such planning, will, for example, make it very difficult to maintain a guaranteed QoS, Quality of Service.
  • the present invention discloses a method by means of which it will be possible to guarantee the frequency "alignment" for TD EUL non-scheduled and scheduled transmissions by means of a "frequency migration", if needed when a conflict between non-scheduled and scheduled transmission frequencies are about to happen.
  • a basic principle of the invention is to let one of the planned transmission types "migrate" to the frequency which is planned for the transmission of the other type, so that both transmission types, scheduled and non-scheduled will take place on one and the same frequency.
  • the non-scheduled transmissions will move to the frequency which is planned for the scheduled transmission, or vice versa, i.e. the scheduled transmissions will move to the frequency which is planned for the non-scheduled transmissions.
  • the NodeB will monitor if the scheduled and non-scheduled transmissions are scheduled to take place on different frequencies or not and if this is the case, the NodeB sends a message to the RNC requesting that the non-scheduled transmission be moved to the same frequency as the scheduled transmission, and the RNC carries out this request, so that both transmissions will take place on one and the same frequency.
  • the messages from the NodeB to the RNC can be sent out in a number of ways, such as:
  • the message from the NodeB to the RNC is sent as an information element, an IE, in a TD-SCDMA message, suitably the message "Radio Link Reconfiguration Ready”.
  • the message from the NodeB to the RNC is sent as a field in an information element, an IE, in a TD-SCDMA message, suitably the message "Radio Link Reconfiguration Ready”.
  • the message from the NodeB to the RNC is sent as a separate message, which would then be a new message added to the standard as it is at the time that this text is written.
  • the RNC can confirm the frequency migration in a number of different ways, any of which can be combined with the way that the message from the NodeB is sent:
  • the RNC can confirm the move of the transmission to the NodeB by means of an information element, an IE, in a TD-SCDMA message such as the message "Radio Link Reconfiguration Commit".
  • the RNC can confirm the move of the transmission to the NodeB by means of a field in an information element, an IE, in a TD-SCDMA message such as the message "Radio Link Reconfiguration Commit".
  • the RNC can confirm the move of the transmission to the NodeB by means of a separate TD-SCDMA message, which would then be a new message added to the standard as it is at the time that this text is written.
  • the frequency re-allocation or "migration" scheme proposed by the present invention should preferably only be used in the case that a conflict of frequency utilization between TD-SCDMA EUL non-scheduled transmission frequency and scheduled transmission frequency is about to happen.
  • TD-SCDMA messages which are exchanged between the RNC, the NodeB and the UE are shown with numbers 11-17 in the example of fig 2, and are as follows:
  • RRC connection Setup Request sent from the UE to NodeB, and then to the RNC.
  • Radio Link Setup sent from the RNC to the NodeB.
  • Radio Link Setup Response sent from the NodeB to the RNC.
  • RRC connection setup sent from the RNC to the UE via the NodeB.
  • RRC Connection Setup Complete sent from the UE to the NodeB, and then to the RNC.
  • Radio Link Reconfiguration Prepare, sent from the RNC to the NodeB.
  • Radio Link Reconfiguration Ready sent from the NodeB to the RNC.
  • Radio Link Reconfiguration Commit sent from the RNC to the NodeB
  • Preparations are made to establish EUL scheduled transmissions on frequency F2.
  • the NodeB compares the planned EUL scheduled transmission frequency to the EUL non-scheduled transmissions, and sees that the two frequencies, i.e. F1 and F2 are not the same, and signals this to the RNC via message 17, i.e. Radio Link
  • the RNC checks if the TD EUL non- scheduled transmission move is possible to carry out or not, for example with respect to such factors as available radio resources, for example time slots and channelization codes in the "target" frequency band. If the frequency move is possible, the RNC signals its acceptance of the move of the non-scheduled transmission to the NodeB via message 18, i.e. Radio Link Reconfiguration Commit.
  • Preparations are made by the RNC and the NodeB to establish EUL scheduled transmissions oh frequency F2 and to shift the EUL non- scheduled transmissions to frequency F2.
  • EUL non-scheduled transmission and scheduled transmission are both established on frequency F2.
  • the present invention can also be used in other cases, such as, for example, if the NodeB finds that the data load in one carrier is too high, and the NodeB therefore wishes to "open up" a new carrier out of the N possible carriers in the N-carriers system.
  • the NodeB can send a message to the RNC with a proposed new data carrier frequency, which would then also be the new non-scheduled transmission frequency. If the RNC accepts the frequency migration for the non-scheduled transmissions, the RNC can initiate a procedure to move the non-scheduled transmissions to the proposed new carrier. After the move, the NodeB can then schedule the scheduled transmission to the new carrier. This is shown in fig 3, with the messages exchanged between the RNC, the NodeB and the UE numerals being the following:
  • Radio Link Reconfiguration Prepare, sent from the RNC to the NodeB.
  • Radio Link Reconfiguration Ready sent from the NodeB to the RNC.
  • Radio Link Reconfiguration Commit sent from the RNC to the NodeB
  • the invention provides a NodeB in an N-carrier TD-SCDMA EUL system with the capability of flexibly managing its radio resources, in particular to settle the issue of conflicts between transmission frequencies for the TD-SCDMA EUL control and data channels.
  • Fig 4 shows a schematic flow chart of a method 400 of the invention. Steps which are options or alternatives are shown with dashed lines in fig 4.
  • the method 400 is intended for use in a TD-SCDMA system which uses EUL technology.
  • a number of terminals, UEs are used in a cell in the system, and as shown in step 410, a controlling node, a NodeB, serves to control traffic to and from the UEs in the cell.
  • step 415 there are scheduled and non scheduled transmissions on the EUL, and, as shown in step 420, the system comprises an RNC, a Radio Network Controller.
  • Step 425 shows that the scheduled transmissions are controlled by the NodeB
  • step 430 shows that the non- scheduled transmissions are controlled by the RNC.
  • step 435 if a scheduled and a non-scheduled transmission are planned to take place on different frequencies, a change is made so that both transmissions will take place on one and the same frequency.
  • Step 440 shows that in one embodiment of the invention, the RNC and/or the NodeB monitors if the scheduled and non-scheduled transmissions are scheduled to take place on different frequencies or not. As indicated in step 445, if the transmissions are planned to take place on different frequencies and this is noticed by the NodeB, the NodeB sends a message to the RNC requesting that the non-scheduled transmission be moved to the same frequency as the scheduled transmission, and the RNC carries out this request, so that both transmissions will take place on one and the same frequency.
  • Step 450 shows that in one embodiment, the message from the NodeB to the RNC is sent as an information element, an IE, in a TD-SCDMA message, such as the message "Radio Link Reconfiguration Ready", while step 455 shows that in another embodiment, the message from the NodeB to the RNC is sent as a field in an information element, an IE, in a TD-SCDMA message such as the message "Radio Link Reconfiguration Ready".
  • the RNC can confirm the move of the transmission to the NodeB by means of a field in an information element, an IE, in a TD-SCDMA message such as "Radio Link Reconfiguration Commit", or by means of a separate TD-SCDMA message.
  • the NodeB monitors if the scheduled and non-scheduled transmissions are planned to take place on different frequencies or not and if this is the case, the NodeB reschedules its scheduled transmissions to be moved to the same frequency as the non- scheduled transmission.
  • Fig 5 shows a schematic block diagram of a transceiver 500 for use as a NodeB in a system in which the invention is applied.
  • the NodeB 500 will comprise an antenna, shown as block 510, and will also comprise a receive part 520 and a transmit part 530.
  • the NodeB 500 also comprises a control means 540 such as a micro processor, as well as a memory 550.
  • the NodeB 500 also comprises an interface 560 towards the RNC, said interface suitably being a landline interface. Since the major components of the NodeB 500 have been identified above both with respect to their function with and their reference numbers, they may in the following be referenced merely by their reference numbers, e.g. "the means 510", instead of "the antenna 510".
  • the NodeB 500 of the invention is intended for use in a TD-SCDMA system which also comprises an RNC and which system uses EUL technology with scheduled and non scheduled transmissions on the EUL.
  • the NodeB uses the means 510, 520, 530, 540, 550 for controlling traffic to and from the UEs in a cell and for controlling the scheduled transmissions, and also uses those means as well as the interface 560 for monitoring if a scheduled and a non-scheduled transmission are planned to take place on different frequencies. In that case, the Node B uses the means 540, 550, and 560 for effecting a change so that both transmissions will take place on one and the same frequency.
  • the NodeB uses the means 540, 550, 560 for, sending a message to the RNC requesting that the non-scheduled transmission be moved to the same frequency as the scheduled transmission, so that both transmissions will take place on one and the same frequency.
  • the NodeB 500 can send the message to the RNC as an information element, an IE, in a TD-SCDMA message, such as the message "Radio Link Reconfiguration Ready", and can use the interface 560 for receiving a confirmation of said message from the RNC by means of an information element, an IE, in a TD-SCDMA message such as the message "Radio Link Reconfiguration Commit”.
  • the NodeB can use the means 540, 550, 560 for sending the message to the RNC as a field in an information element, an IE, in a TD - SCDMA message such as the message "Radio Link Reconfiguration Ready", and can use the interface 560 for receiving confirmation from the RNC by means of a field in an information element, an IE, in a TD-SCDMA message such as "Radio Link Reconfiguration Commit".
  • the NodeB 500 uses the means 540, 550, 560 for sending the message to the RNC as a separate TD-SCDMA message, and can use the interface 560 for receiving confirmation from the RNC of the move of the transmission by means of a separate TD-SCDMA message.
  • the NodeB 500 uses the means 540, 550, 560 for monitoring if the scheduled and non-scheduled transmissions are planned to take place on different frequencies or not and if this is the case, for rescheduling its scheduled transmissions to be moved to the same frequency as the non-scheduled transmission.

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Abstract

The invention discloses a method (400) for a TD-SCDMA system (100) which uses EUL technology (420). According to the method, a number of terminals, UEs (120), are used in a cell (110) in the system, a controlling node, a NodeB (130), serves to control (410) traffic to and from the UEs in the cell, and there are scheduled and non scheduled transmissions on the EUL. The system comprises (415) an RNC (140), the scheduled transmissions are controlled (430) by the NodeB, and the non-scheduled transmissions are controlled (435) by the RNC). If a scheduled and a non-scheduled transmission are planned to take place on different frequencies, a change is made so that both transmissions will take place on one and the same frequency.

Description

RU ASSIGNMENT IN TD-SCDMA EUL
TECHNICAL FIELD
The present invention discloses a method for use in a TD-SCDMA system which uses EUL technology, in which system there is a number of terminals, UEs, in a cell in the system, with a NodeB which serves to control the traffic to and from the UEs in a cell, the system also comprising a Radio Network Controller.
BACKGROUND
EUL, Enhanced Uplink, or HSUPA1 High Speed Uplink Packet Access, is a 3G (third generation) mobile communication evolution technology which is used to optimize the radio resource utilization for packet services in uplink, i.e. in transmissions from users, UEs, in a cell to the controlling node of the cell, the NodeB.
In the 3G Partnership Project, also known as 3GPP, EUL is standardized, for example for the TD-SCDMA system, Time Division Synchronous Code Division Multiple Access. The abbreviation TD EUL is here used for TD- SCDMA systems in which EUL is enabled. EUL is sometimes also referred to as HSUPA, High Speed Uplink Packet Access.
According to the CCSA, the Chinese Communication Standardization Association, so called N-carrier techniques are standardized as a TD- SCDMA specific multiple frequency (i.e. using N carrier frequencies) technology for improving the system capacity and for optimizing the power utilization/coverage balance between common (i.e. shared) timeslots and traffic timeslots in TD-SCDMA.
So called RRM, Radio Resource Management, is used in 3G and in other mobile cellular systems in order to optimize the handling of the available radio resource units, RUs, as effectively as possible. In an N-carrier TD EUL system, when a connection to a UE is set up, either initially or as a reconfiguration, a control channel is established between the UE and the RNC, the Radio Network Controller, via the NodeB, to carry control signalling, and when/if the UE subsequently needs to make data transmissions, the network, i.e. in this case the RNC will try to find a suitable frequency band which is assigned to TD EUL services and which can be used for those data transmissions, the word "suitable" here being used with respect to such factors as radio propagation and radio resources in use on each of the available frequency bands.
The procedure for EUL data transmissions for a UE is that when a UE requests an EUL session, the NodeB selects and recommends a frequency for the EUL traffic, and sends this recommendation to the RNC, the Radio Node Controller. The RNC then decides if this frequency or some other frequency should be used for the EUL session for the UE in question.
In the EUL uplink, there are both scheduled transmissions and non- scheduled transmission. The scheduled transmissions are data transmissions and are scheduled by the NodeB per TTI, Transmission Time Interval, while the non-scheduled transmissions are control signal transmissions which are controlled by the RNC.
In an N-carrier TD EUL system, due to limitations on the transmission capabilities of the UEs, EUL data transmissions can only be made from a UE on one carrier at a time, which means that the control channel signalling and the data transmission channel need to work on the same frequency.
SUMMARY
It is a purpose of the present invention to present a solution to handling the frequency allocation of scheduled and non-scheduled transmissions in a TD- SCDMA EUL system in an improved manner as compared to present day systems. This purpose is achieved by the present invention in that it discloses a method for use in a TD-SCDMA system which uses EUL technology, according to which method: • a number of terminals, UEs, are used in a cell in the system,
• a controlling node, a NodeB, serves to control traffic to and from UEs in the cell,
• there are scheduled and non scheduled transmissions on the EUL,
• the system comprises an RNC, a Radio Network Controller, • the scheduled transmissions are controlled by the NodeB,
• the non-scheduled transmissions are controlled by the RNC.
According to the inventive method, if a scheduled and a non-scheduled transmission are planned to take place on different frequencies, a change is made so that both transmissions will take place on one and the same frequency.
Suitably, either the RNC and/or the NodeB monitors if the scheduled and non-scheduled transmissions are scheduled to take place on different frequencies or not.
In the case where the NodeB monitors if the scheduled and non-scheduled transmissions are scheduled to take place on different frequencies or not, and the NodeB notices that this is the case, the NodeB sends a message to the RNC requesting that the non-scheduled transmission be moved to the same frequency as the scheduled transmission. The request is carried out by the RNC, so that both transmissions will be carried out on one and the same frequency.
In one aspect of the invention, the message from the NodeB to the RNC is sent as an information element, an IE, in the message "Radio Link Reconfiguration Ready", and it is also possible to let the RNC confirm the move of the transmission by means of the message "Radio Link Reconfiguration Commit" to the NodeB.
In another aspect of the invention, the NodeB monitors if the scheduled and non-scheduled transmissions are planned to take place on different frequencies or not, and if that is so, the NodeB reschedules its scheduled transmissions to take place on the same frequency as the non-scheduled transmissions.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in more detail in the following, with reference to the appended drawings, in which
Fig 1 shows a basic view of a system in which the invention may be used, and
Fig 2 and 3 show examples of the invention, and Fig 4 shows a flow chart of the inventive method, and Fig 5 shows a block diagram of a NodeB of the invention.
DETAILED DESCRIPTION
Fig 1 shows a schematic view of a system 100 in which the invention may be applied. The system 100 is a so called TD-SCDMA system, Time Division Synchronous Code Division Multiple Access, and, as shown in fig 1 , the system 100 comprises a number of cells, one of which is shown as 110 in fig 1. In each cell there can be a number of users, so called UEs, "User Equipment", one of which is shown as 120 in fig 1 , and each cell will also comprise a controlling node, a so called NodeB, shown as 130 in fig 1 , which serves, inter alia, to control the traffic to and from the UEs in the cell.
In addition to the NodeB 130, the system will also comprise at least one so called Radio Network Controller, an RNC, 140 in fig 1 , which has as one of its functions to control the radio resource units, the RUs, of NodeBs which are attached to the RNC. Examples of RUs are frequency carriers, time slots and so called channelization codes
As shown schematically in fig 1 , so called Enhanced UpLink, EUL, is enabled in the system 100. EUL is also sometimes referred to as HSUPA, High Speed Uplink Packet Access.
The system 100 is a so called N-carrier TD-SCDMA EUL system, the so called "N carrier" technique being a TD-SCDMA specific multiple frequency ("N carrier") technology which improves the system capacity and optimizes the balance between power utilization and coverage.
As stated previously, a purpose of the present invention to improve the frequency allocation of the so called scheduled and non-scheduled transmissions in a TD-SCDMA EUL system such as the one 100 in fig 1.
As also explained initially, the non-scheduled transmissions are control channel transmissions to/from the UE, while the scheduled transmissions are data transmissions to/from the UE. The non-scheduled transmissions are planned in frequency by the RNC, while the scheduled transmissions are planned in frequency by the NodeB.
Due to limitations of the UE, the UE can only transit on one frequency at a time, which means that problems will arise if the control transmissions and the data transmissions are planned to take place on different frequencies. Such planning, will, for example, make it very difficult to maintain a guaranteed QoS, Quality of Service.
The present invention discloses a method by means of which it will be possible to guarantee the frequency "alignment" for TD EUL non-scheduled and scheduled transmissions by means of a "frequency migration", if needed when a conflict between non-scheduled and scheduled transmission frequencies are about to happen. A basic principle of the invention is to let one of the planned transmission types "migrate" to the frequency which is planned for the transmission of the other type, so that both transmission types, scheduled and non-scheduled will take place on one and the same frequency. Thus, either the non-scheduled transmissions will move to the frequency which is planned for the scheduled transmission, or vice versa, i.e. the scheduled transmissions will move to the frequency which is planned for the non-scheduled transmissions.
Suitably, according to the invention, the NodeB will monitor if the scheduled and non-scheduled transmissions are scheduled to take place on different frequencies or not and if this is the case, the NodeB sends a message to the RNC requesting that the non-scheduled transmission be moved to the same frequency as the scheduled transmission, and the RNC carries out this request, so that both transmissions will take place on one and the same frequency. •
In this embodiment of the invention, the messages from the NodeB to the RNC can be sent out in a number of ways, such as:
• The message from the NodeB to the RNC is sent as an information element, an IE, in a TD-SCDMA message, suitably the message "Radio Link Reconfiguration Ready".
• The message from the NodeB to the RNC is sent as a field in an information element, an IE, in a TD-SCDMA message, suitably the message "Radio Link Reconfiguration Ready". • The message from the NodeB to the RNC is sent as a separate message, which would then be a new message added to the standard as it is at the time that this text is written.
Similarly, the RNC can confirm the frequency migration in a number of different ways, any of which can be combined with the way that the message from the NodeB is sent:
• The RNC can confirm the move of the transmission to the NodeB by means of an information element, an IE, in a TD-SCDMA message such as the message "Radio Link Reconfiguration Commit".
• The RNC can confirm the move of the transmission to the NodeB by means of a field in an information element, an IE, in a TD-SCDMA message such as the message "Radio Link Reconfiguration Commit".
• The RNC can confirm the move of the transmission to the NodeB by means of a separate TD-SCDMA message, which would then be a new message added to the standard as it is at the time that this text is written.
It can, however, be pointed out that the frequency re-allocation or "migration" scheme proposed by the present invention should preferably only be used in the case that a conflict of frequency utilization between TD-SCDMA EUL non-scheduled transmission frequency and scheduled transmission frequency is about to happen.
An example of a sequence of events in a TD-SCDMA system in which EUL is enabled and in which the present invention is applied is shown in fig 2. TD-SCDMA messages which are exchanged between the RNC, the NodeB and the UE are shown with numbers 11-17 in the example of fig 2, and are as follows:
11. RRC connection Setup Request, sent from the UE to NodeB, and then to the RNC.
12. Radio Link Setup, sent from the RNC to the NodeB.
13. Radio Link Setup Response, sent from the NodeB to the RNC.
14. RRC connection setup, sent from the RNC to the UE via the NodeB.
15. RRC Connection Setup Complete, sent from the UE to the NodeB, and then to the RNC.
16. Radio Link Reconfiguration Prepare, sent from the RNC to the NodeB.
17. Radio Link Reconfiguration Ready, sent from the NodeB to the RNC.
18. Radio Link Reconfiguration Commit, sent from the RNC to the NodeB
Next to the sequence of messages shown in fig 2, an attempt has been made to show the frequency allocation of the transmission types, tied to the various messages 11-18, as shown with brackets. The numerals 1-5 in fig 2 correspond to the following activities: 1. Preparations are made to establish EUL non-scheduled transmissions on frequency F1.
2. EUL non-scheduled transmissions are established on frequency F1.
3. Preparations are made to establish EUL scheduled transmissions on frequency F2. The NodeB compares the planned EUL scheduled transmission frequency to the EUL non-scheduled transmissions, and sees that the two frequencies, i.e. F1 and F2 are not the same, and signals this to the RNC via message 17, i.e. Radio Link
Reconfiguration Ready. The RNC checks if the TD EUL non- scheduled transmission move is possible to carry out or not, for example with respect to such factors as available radio resources, for example time slots and channelization codes in the "target" frequency band. If the frequency move is possible, the RNC signals its acceptance of the move of the non-scheduled transmission to the NodeB via message 18, i.e. Radio Link Reconfiguration Commit.
4. Preparations are made by the RNC and the NodeB to establish EUL scheduled transmissions oh frequency F2 and to shift the EUL non- scheduled transmissions to frequency F2.
5. EUL non-scheduled transmission and scheduled transmission are both established on frequency F2.
Apart from the case illustrated above, i.e. when the UE wishes to set up an EUL session, the present invention can also be used in other cases, such as, for example, if the NodeB finds that the data load in one carrier is too high, and the NodeB therefore wishes to "open up" a new carrier out of the N possible carriers in the N-carriers system. In such a case, the NodeB can send a message to the RNC with a proposed new data carrier frequency, which would then also be the new non-scheduled transmission frequency. If the RNC accepts the frequency migration for the non-scheduled transmissions, the RNC can initiate a procedure to move the non-scheduled transmissions to the proposed new carrier. After the move, the NodeB can then schedule the scheduled transmission to the new carrier. This is shown in fig 3, with the messages exchanged between the RNC, the NodeB and the UE numerals being the following:
21. Proposal to move the non-scheduled transmissions from F2 to F1 , sent from the NodeB to the RNC. The message is "Non-scheduled
Transmission Frequency Proposal
22. Radio Link Reconfiguration Prepare, sent from the RNC to the NodeB.
23. Radio Link Reconfiguration Ready, sent from the NodeB to the RNC.
24. Radio Link Reconfiguration Commit, sent from the RNC to the NodeB
The "frequency activities" next to the messages 21-24 are shown with the numerals 7, 8 and 9, said activities being:
7. EUL non-scheduled and scheduled transmissions on frequency F2, with the load on F2 being over a certain threshold, which is noticed by the NodeB.
8. Preparations to move the EUL non-scheduled transmissions to frequency F2, 9. Both the scheduled and the non-scheduled transmission are moved to frequency F1.
In conclusion, the invention provides a NodeB in an N-carrier TD-SCDMA EUL system with the capability of flexibly managing its radio resources, in particular to settle the issue of conflicts between transmission frequencies for the TD-SCDMA EUL control and data channels.
Fig 4 shows a schematic flow chart of a method 400 of the invention. Steps which are options or alternatives are shown with dashed lines in fig 4.
As has been explained previously, the method 400 is intended for use in a TD-SCDMA system which uses EUL technology. According to the method, as shown in step 405, a number of terminals, UEs, are used in a cell in the system, and as shown in step 410, a controlling node, a NodeB, serves to control traffic to and from the UEs in the cell.
As illustrated in step 415, there are scheduled and non scheduled transmissions on the EUL, and, as shown in step 420, the system comprises an RNC, a Radio Network Controller. Step 425 shows that the scheduled transmissions are controlled by the NodeB, and step 430 shows that the non- scheduled transmissions are controlled by the RNC.
As indicated in step 435, if a scheduled and a non-scheduled transmission are planned to take place on different frequencies, a change is made so that both transmissions will take place on one and the same frequency.
Step 440 shows that in one embodiment of the invention, the RNC and/or the NodeB monitors if the scheduled and non-scheduled transmissions are scheduled to take place on different frequencies or not. As indicated in step 445, if the transmissions are planned to take place on different frequencies and this is noticed by the NodeB, the NodeB sends a message to the RNC requesting that the non-scheduled transmission be moved to the same frequency as the scheduled transmission, and the RNC carries out this request, so that both transmissions will take place on one and the same frequency.
Step 450 shows that in one embodiment, the message from the NodeB to the RNC is sent as an information element, an IE, in a TD-SCDMA message, such as the message "Radio Link Reconfiguration Ready", while step 455 shows that in another embodiment, the message from the NodeB to the RNC is sent as a field in an information element, an IE, in a TD-SCDMA message such as the message "Radio Link Reconfiguration Ready".
The RNC can confirm the move of the transmission to the NodeB by means of a field in an information element, an IE, in a TD-SCDMA message such as "Radio Link Reconfiguration Commit", or by means of a separate TD-SCDMA message.
Also, according to the invention, in one embodiment, the NodeB monitors if the scheduled and non-scheduled transmissions are planned to take place on different frequencies or not and if this is the case, the NodeB reschedules its scheduled transmissions to be moved to the same frequency as the non- scheduled transmission.
Fig 5 shows a schematic block diagram of a transceiver 500 for use as a NodeB in a system in which the invention is applied. As indicated in fig 5, the NodeB 500 will comprise an antenna, shown as block 510, and will also comprise a receive part 520 and a transmit part 530. In addition, the NodeB 500 also comprises a control means 540 such as a micro processor, as well as a memory 550. Furthermore, the NodeB 500 also comprises an interface 560 towards the RNC, said interface suitably being a landline interface. Since the major components of the NodeB 500 have been identified above both with respect to their function with and their reference numbers, they may in the following be referenced merely by their reference numbers, e.g. "the means 510", instead of "the antenna 510".
Thus, the NodeB 500 of the invention is intended for use in a TD-SCDMA system which also comprises an RNC and which system uses EUL technology with scheduled and non scheduled transmissions on the EUL.
The NodeB uses the means 510, 520, 530, 540, 550 for controlling traffic to and from the UEs in a cell and for controlling the scheduled transmissions, and also uses those means as well as the interface 560 for monitoring if a scheduled and a non-scheduled transmission are planned to take place on different frequencies. In that case, the Node B uses the means 540, 550, and 560 for effecting a change so that both transmissions will take place on one and the same frequency.
In one embodiment, if the transmissions are planned to take place on different frequencies and this is noticed by the NodeB, the NodeB uses the means 540, 550, 560 for, sending a message to the RNC requesting that the non-scheduled transmission be moved to the same frequency as the scheduled transmission, so that both transmissions will take place on one and the same frequency.
The NodeB 500 can send the message to the RNC as an information element, an IE, in a TD-SCDMA message, such as the message "Radio Link Reconfiguration Ready", and can use the interface 560 for receiving a confirmation of said message from the RNC by means of an information element, an IE, in a TD-SCDMA message such as the message "Radio Link Reconfiguration Commit". Alternatively, the NodeB can use the means 540, 550, 560 for sending the message to the RNC as a field in an information element, an IE, in a TD - SCDMA message such as the message "Radio Link Reconfiguration Ready", and can use the interface 560 for receiving confirmation from the RNC by means of a field in an information element, an IE, in a TD-SCDMA message such as "Radio Link Reconfiguration Commit".
In another embodiment, the NodeB 500 uses the means 540, 550, 560 for sending the message to the RNC as a separate TD-SCDMA message, and can use the interface 560 for receiving confirmation from the RNC of the move of the transmission by means of a separate TD-SCDMA message.
In one embodiment, the NodeB 500 uses the means 540, 550, 560 for monitoring if the scheduled and non-scheduled transmissions are planned to take place on different frequencies or not and if this is the case, for rescheduling its scheduled transmissions to be moved to the same frequency as the non-scheduled transmission.
The invention is not limited to the examples of embodiments described above and shown in the drawings, but may be freely varied within the scope of the appended claims. In addition, although the invention has been described throughout above as being applied in a TD-SCDMA system, it should be understood that the invention can also be applied in other systems, such as, for example, WCDMA, Wideband Code Division Multiple Access, and other cellular systems where the problems addressed by the invention may arise.

Claims

1. A method (400) for use in a TD-SCDMA system (100) which uses EUL technology, according to which method: • (405): a number of terminals, UEs (120), are used in a cell (110) in the system,
• (410): a controlling node, a NodeB (130), serves to control (410) traffic to and from the UEs in the cell,
• (415): there are scheduled and non scheduled transmissions on the EUL,
• (420): the system comprises an RNC (140),
• (425): the scheduled transmissions are controlled by the NodeB,
• (430): the non-scheduled transmissions are controlled by the RNC, the method (400) being characterized in that (435) if a scheduled and a non- scheduled transmission are planned to take place on different frequencies, a change is made so that both transmissions will take place on one and the same frequency.
2. The method (400, 440) of claim 1 , according to which the RNC (140) and/or the NodeB (130) monitors if the scheduled and non-scheduled transmissions are scheduled to take place on different frequencies or not.
3. The method (400, 440, 445) of claim 2, according to which, if the transmissions are planned to take place on different frequencies and this is noticed by the NodeB, the NodeB sends a message to the RNC requesting that the non-scheduled transmission be moved to the same frequency as the scheduled transmission, and the RNC carries out this request, so that both transmissions will take place on one and the same frequency.
4. The method (400, 440, 445, 450) of claim 3, according to which the message from the NodeB to the RNC is sent as an information element, an IE, in a TD-SCDMA message, such as the message "Radio Link Reconfiguration Ready".
5. The method (400, 440, 445, 450) of any of claims 2-4, according to which the RNC confirms the move of the transmission to the NodeB by means of an information element, an IE, in a TD-SCDMA message such as the message "Radio Link Reconfiguration Commit".
6. The method of claim 3 (400, 440, 445, 455), according to which the message from the NodeB to the RNC is sent as a field in an information element, an IE, in a TD-SCDMA message such as the message "Radio Link Reconfiguration Ready".
7. The method (400, 440, 445, 455) of any of claims 3 or 6, according to which the RNC confirms the move of the transmission to the NodeB by means of a field in an information element, an IE, in a TD-SCDMA message such as "Radio Link Reconfiguration Commit".
8. The method of claim 3, according to which the message from the NodeB to the RNC is sent as a separate in a TD-SCDMA message.
9. The method of any of claims 3 or 8, according to which the RNC confirms the move of the transmission by means of a separate TD-SCDMA message.
10. The method of claim 1 or 2, according to which the NodeB monitors if the scheduled and non-scheduled transmissions are planned to take place on different frequencies or not and if this is the case, the NodeB reschedules its scheduled transmissions to be moved to the same frequency as the non- scheduled transmission.
11. A NodeB (500) for use in a TD-SCDMA system (100) which also comprises an RNC (140) and which system uses EUL technology with scheduled and non scheduled transmissions on the EUL, the NodeB (500) being equipped with means (510, 520, 530, 540, 550) for controlling traffic to and from the UEs in a cell and for controlling the scheduled transmissions, the NodeB being characterized in that it is equipped with means (510, 520, 540, 550, 560) for monitoring if a scheduled and a non-scheduled transmission are planned to take place on different frequencies, and with means (540, 550, 560) for, in that case, effecting a change so that both transmissions will take place on one and the same frequency.
12. The NodeB (500) of claim 11 , being equipped with means (540, 550, 560) for, if the transmissions are planned to take place on different frequencies and this is noticed by the NodeB, sending a message to the RNC requesting that the non-scheduled transmission be moved to the same frequency as the scheduled transmission, so that both transmissions will take place on one and the same frequency.
13. The NodeB (500) of claim 12, which sends the message to the RNC as an information element, an IE, in a TD-SCDMA message, such as the message "Radio Link Reconfiguration Ready".
14. The NodeB (500) of claim 12 or 13, being equipped with means (560) for receiving a confirmation of said message from the RNC by means of an information element, an IE, in a TD-SCDMA message such as the message "Radio Link Reconfiguration Commit".
15. The NodeB (500) of claim 12, being equipped with means (540, 550, 560) for sending the message to the RNC as a field in an information element, an IE, in a TD-SCDMA message such as the message "Radio Link Reconfiguration Ready".
16. The NodeB (500) of claim 12 or 15, being equipped with means (560) for receiving confirmation from the RNC by means of a field in an information element, an IE, in a TD-SCDMA message such as "Radio Link Reconfiguration Commit".
17. The NodeB (500) of claim 12, being equipped with means (540, 550, 560) for sending the message to the RNC as a separate TD-SCDMA message.
18. The NodeB (500) of claim 12 or 17, being equipped with means (560) for receiving confirmation from the RNC of the move of the transmission by means of a separate TD-SCDMA message.
19. The NodeB (500) of claim 12 or 13, being equipped with means (540, 550, 560) for monitoring if the scheduled and non-scheduled transmissions are planned to take place on different frequencies or not and if this is the case, for rescheduling its scheduled transmissions to be moved to the same frequency as the non-scheduled transmission.
PCT/SE2008/051100 2007-11-26 2008-09-30 Ru assignment in td-scdma eul WO2009070094A1 (en)

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Citations (2)

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