Mobile telecommunications system
a telecommunication system and mobile technology, applied in the field of mobile telecommunication systems, can solve problems such as difficult to achieve simple tasks, and achieve the effect of reducing processing load and avoiding unnecessary use of cn or rn
Inactive Publication Date: 2007-01-18
NEC CORP
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- Abstract
- Description
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- Application Information
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Benefits of technology
[0005] In a first aspect, the invention provides a method of processing a handover request from a base station controller (BSC) of a GSM network, the method comprising passing a handover request with GSM parameters from a base station controller (BSC) through a Master Switching Centre (MSC) of the GSM network to a UMTS core network (C) and to a Radio Network Controller (RNC) of the UMTS network; in the radio network controller, translating the GSM parameters to UTRAN parameters; and allocating UTRAN resources in response to the translated parameters. Thus, rather than translating the GSM parameters on entry to the UMTS network, the GSM parameters pass transparently through at least a portion of the UMTS network to the RNC. The parameters may include one or more of data rate, call type (voice, data, fax, other, e.g. video, IP), Quality of Service etc. This reduces processing load elsewhere in the network and enables the RNC to allocate the optimum UTRAN resources for the call.
[0006] Preferably, the RNC is arranged to switch directly from a GSM connection to a soft handover UMTS mode. This is advantageous compared to simply establishing an individual connection from the User Equipment (UE) to a single UMTS access node. This preferred features may be provided independently in a second aspect in which the invention provides a method of switching from a GSM network to a UMTS network characterised by switching directly from a mode in which User Equipment (UE) is in communication with a GSM base station to a UMTS diversity mode in which the User Equipment is in communication with a plurality of UMTS access nodes, preferably comprising configuring the UTRAN so that a plurality of access nodes are prepared to communicate with the UE and / or preferably supplying a list of potential access nodes to the UE.
[0007] Preferably, the Radio Network Controller (RNC) is arranged, following translation of the GSM format handover request firstly to perform radio link setup and then, following a response from the radio link, to perform data transport setup for communication between the Radio Network Controller and the Core Network, This allows communication with the Core Network to be established following successful radio setup rather than independently, thus avoiding unnecessary use of CN or RNC (Iu interface) resources if radio link setup is not possible. This preferable feature may be provided independently in a third aspect in which the invention provides a method of establishing UMTS communication with User Equipment following receipt by a Radio Network Controller of a GSM handover request, the method comprising, in the Radio Network Controller, setting up a radio link to a Node B and, following acknowledgement of the radio link setup, in the Radio Network Controller, setting up data transport between the Radio Network Controller and the Core Network.
[0010] Thus, in contrast to the initial step, where GSM information tunnels into the UMTS network and is interpreted in the RNC, the UTRAN information tunnels through the GSM network without interpretation and is interpreted by the UE. This means that the GSM network need not include intelligence to process the information, simplifying interconnection with existing GSM networks.
Problems solved by technology
However, this is not a straightforward task to accomplish and there are a number of problems to implement before this can be successfully achieved; the present invention is concerned with these problems.
Method used
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Embodiment Construction
[0018] 1. The BSC sends Handover Required message to the GSM MSC. This includes the GSM information elements (service information rate, service type, etc.) and the UMTS cell / Node-B information on which good radio quality is achievable.
[0019] 2. The GSM MSC sends MAP / E message Prepare Handover to the UMTS CN forwarding the UMTS cell-ids transparently.
[0020] 3. The CN sends RANAP message Handover Request to the Target RNC. This message will contain information elements indicating from which network type this handover is taking place e.g. “handover-type”=“from GSM”. It will also contain information elements allowing transparent transfer of GSM Parameters to the RNC, e.g. GSM Bearer Capability, version number and other relevant parameters relating to the GSM call. Additionally, the relevant UMTS cell / Node-B information provided by the MS-UE is also transferred transparently to the RNC.
[0021] 4. The RNC maps GSM appropriate call parameters to the relevant UMTS logical channel, transpo...
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A method of processing a handover request from a base station controller (BSC) of a GSM (Global System for Mobile communication)-type network. The method comprises the steps of passing a handover request with GSM-type parameters from a base station controller (BSC) through a Master Switching Center (MSC) of the GSM-type network to a UMTS core network (CN) and to a Radio Network Controller (RNC) of the UMTS (Universal Mobile Telecommunications System) network, translating the GSM-type parameters to UTRAN parameters in the Radio Network Controller (RNC), and allocating UTRAN resources in response to the translated parameters.
Description
CROSS-REFERENCE TO RELATED PATENT APPLICATIONS [0001] This application is a continuation of application Ser. No. 10 / 790,674, filed Mar. 3, 2004, now pending; which is a continuation of application Ser. No. 09 / 578,705, filed May 26, 2000, now U.S. Pat. No. 6,725,039, issued Apr. 20, 2004, which claims priority from British Patent Application No. 9912604.7, filed May 28, 1999, by Gina Parmar and Robert Patterson, all of which are incorporated herein by reference in their entirety. This application claims only subject matter disclosed in the parent application and therefore presents no new matter.BACKGROUND OF THE INVENTION [0002] The present invention relates to a mobile telecommunication system and is particularly concerned with the handover of calls between two types of communication systems, particularly handover between a GSM and a UMTS network. [0003] It has been generally proposed that it would be desirable to provide handover between a GSM and a UMTS network. However, this is n...
Claims
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Login to View More IPC IPC(8): H04Q7/20H04L12/28H04L12/46H04L12/56H04W12/10H04W28/18H04W36/00H04W36/14H04W36/18H04W72/04H04W76/02H04W84/04H04W88/12H04W88/14
CPCH04W28/18H04W36/0033H04W36/0061H04W36/0066H04W36/14H04W88/06H04W84/04H04W88/12H04W88/14H04W92/14H04L69/08H04W72/04H04W76/10H04W36/0011H04W36/144H04W84/042
InventorPARMAR, GINAPATTERSON, ROBERT
OwnerNEC CORP