Chris joined Award Solutions in 2000, bringing his expertise in GSM and IS-136 technologies and wireless network planning. He specializes in telecommunications systems, focusing in GSM, GPRS, and UMTS systems, wireless and Internet applications, and the convergence of communication technologies. Currently, he is working on LTE, UMTS, IP Multimedia Subsystem, IP telephony, HSPA+, and Wireless Network Planning. He has over 19 years of experience in the wireless telecom industry.
Chris began his career in the wireless telecommunication industry. He spent the first nine years in the Wireless Systems Engineering department at Nortel Networks. As a Member of Scientific Staff, Chris worked on network planning, customer support, bid support, and capacity planning for low power wireless systems and Personal Communications Systems. He moved into the GSM and IS-136 field as a manager. These responsibilities included working with customers to plan, expand, and manage their existing wireless network. This position evolved into managing the GSM, IS-136 and IS-95 core network capacity team as a Senior Manager. In the role of Senior Manager, Chris worked with the development teams, product test teams, marketing teams, and product line management teams in the determination and requirement establishment of the subscriber capacity of these systems. This included presenting capacity information directly to customers and influencing them in their network evolution direction.
Currently, Chris is a Principal Consultant at Award Solutions. His current focus is LTE, 4G, OFDMA, UMTS/HSPA+, IP convergence, and Network Planning. His interests include the planning of the LTE radio network and core network; service planning in the LTE core network and mobile devices; and interoperations and mobility between LTE and the 3G networks. He is also responsible for helping in the mentoring of new instructors in UMTS and LTE.
Chris holds a Master's degree in Computer Science Telecommunications from the University of Missouri at Kansas City as well as Bachelor's degree in Computer Science and Mathematics from Cameron University. Chris also holds 4 patents in the area of wireless technology.
First of all, Thank you for the very nice explanation.
>One way to interpret this question is to ask how many active bearers a UE can have? Another way to interpret >this question is to ask what the the number of TFTs that a P-GW can support per UE?
>That could be a maximum number of TFTs of 10 (assuming one default bearer and 10 dedicated bearers).
>More than likely there will be a few default bearers and each of those default bearers will also have a dedicated >bearer or two, depending on the scenario.
To me it seems the right question for the above answer is more likely to be ...How many TFT's (Bearers) a PDN can support per UE ? The answer is 10
Considering there can be multiple (N) PDN associated with a single P-GW and a maximum number of 10 TFTs per PDN, hence N*10 numbers of bearers possible.
Having said that , The maximum possible number bearer id is restricted up to 11hence the max linked bearer id (default bearer ID) or N (max) = 11.
Maximum number of bearers possible is 11* 10
Does it make sense?
I am interested to know the answer for this question. Please reply me at email@example.com
Too many questions today.
In section 18.104.22.168[UE requested bearer resource allocation procedure] of 24.301, does this apply to a default bearer or dedicated bearer ?
Is RLC PDU size and grant both same or different.
Do Default Bearer Carry and Data?
Kindly clarify my below queries,
1.Can UE establish 11 DRBs per PDN basis?
2.Consider the case where UE is in 11 DRBs and the 2 SRBs established state and if there is an one to one
mapping between RBs and Logical channels how can all this 13 bearers get mapped because as per the MAC spec
there are only 10 Logical channel Identities are possible.
3.Does the bidirectional bearer need two logical channels at MAC level?
Thanks in Advance.
Can i tell bearer which is default or dedicated bearer by seeing any parameter?
Where are you looking? In the messages themselves, the default bearer will use a different set of GTP and NAS messages than the dedicated. That would be the easiest way to see the difference. Let me know if you have further questions.
Thanks and take care,
For UE initiated dedicated bearer activation, how does interaction with PCRF happens? My assumption was that, PDN gateway after receiving Bearer Resource command(BRC) from SGW, should trigger
PCRF with Credit control request(CCR). Upon successful Credit control answer(CCA), Create bearer request is triggered towards SGW, which in turn goes towards MME, ENB.
Create Bearer response towards PDN gateway should contain the EPS Bearer ID for the dedicated bearer (apart from Linked EBS bearer id). After receiving Create bearer response at PDN gateway, whether there should be another interaction with PCRF to exchange the received EBS bearer id, is this required at first place? If so, what message should be used for this? Again CCR?
In TS 23.203 (Figure 7.4), it has been mentioned that Provisional ACK (message number 15) should be sent to PCRF upon completion of IP CAN session signalling (in this case Create bearer response). Whether this should be done only based on event trigger received from PCRF in the earlier credit control answer?
If this provisional ACK is not requested by PCRF, then is the EPS Bearer ID (created by MME for dedicated bearer) not required for the PCRF?
Could you please provide your views/comments?
You are correct. My understanding is that the UE initiated dedicated bearer will trigger the P-GW to send a CCR to the PCRF. I can't comment more as I have not seen a UE initiated dedicated bearer used in practice, but that is my understanding.
Thanks for sharing ur knowledge with us.
If u have any idea regarding DYNAMIC RESOURCE ALLOCATION (Scheduler), then plesase share with us.
I mean how it is going to allocates UL and DL resources to user and control plane packets
and how it selects the radio bearers whose packets are to be scheduled.