Questions tagged [mobile]
A tag for discussion of "mobile", topics on how the mobile devices proceed to access mobile services
82
questions
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What is the meaning of RSSI?
When using mobile 3G routers, you see in the output of the "show cellullar 0 all" command. What is the significance of this value? Is this interpretation the same when talking about 2G or 3G?
Ex:
...
12
votes
2
answers
560
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Can I use Cisco Anyconnect with mobile devices?
I've got a lot of clients with mobile devices that want to connect to our corporate network which uses Cisco Anyconnect. How can my clients connect to our VPN using a mobile device?
9
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4
answers
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Does IPv6 remove the need for a VPN?
I know that a VPN may be used in lots of different ways for lots of different things, so I'm not suggesting that IPv6 removes the need for a VPN completely.
I'm interested in one particular use-case:
...
8
votes
0
answers
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CISCO ISE Identity Management Group assignment
The Scenario in Brief
Three types of devices can exist on our wireless networks:
AD joined, corporate owned (Windows PC/Laptop/Surface)
Non-AD Joined, corporate owned (iPad/Chromebook and their ...
7
votes
3
answers
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How does a network know whether to send via internet/wifi or through cellular service?
I have a decent understanding of networking, but this question popped up in my head randomly and I can't figure it out. For example, if I have an iPhone that is used on a 3G network but is also ...
7
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3
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Does Cell Phone use Public or Private IP address? [closed]
Does mobile phone/cell phone get a private IP address or public IP address?
If the cell phone gets a private IP address, I assume that the telecom operator uses carrier grade Network Address ...
7
votes
2
answers
522
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Who Actually Utilizes Mobile IP?
I'm presently teaching a networking class, and the various texts that I've cobbled together all discuss Mobile IP. I always try to give real-world examples of how protocols are utilized, but the ...
6
votes
2
answers
104
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Network Ten LTE Hubs Into One Network
I'm working through a tricky situation getting a field office set up out in a very rural area. There are ten 12' x 60' trailers being set up (2-3 metres apart from one another), each with varying ...
5
votes
1
answer
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Do Full MVNO's need S-GW in their LTE network?
Presently I am analysing the LTE network architecture for a full MVNO network.
I am just wondering whether S-GW is required as part of MVNO LTE architecture or MNO - SGW will be able to communicate ...
4
votes
4
answers
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Increasing the MTU size for 3G/LTE networks
Is it reasonable to set higher MTU size between RAN (3g, LTE) and RNC/SGW? Say, we have S1-U interface with GTP encapsulation, which leads to reduced data size for mobile user. Data size can be ...
4
votes
2
answers
216
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Can you create an open LTE network?
Being an ex-politician, I've had to discuss "free city-wide Wi-Fi" many times. What I've always been thinking is, why don't we just have free 3G/4G in the city?
I've some memories of being at a large ...
4
votes
1
answer
773
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Do MVNOs have their own PGWs?
In mobile networks, there is this thing called PGW, which acts as the gateway between the internet and the internal network of the operator.
(From the user's perspective, this could be seen as the ...
4
votes
1
answer
200
views
How is a MS (Mobile Station) Identified prior to GPRS attach?
So, originally the MS sends a Packet Channel Request over PRACH and then the BSC (PCU) responds with a Packet Uplink Assignment over PAGCH. How does this PDTCH allocation get picked up by the correct ...
4
votes
1
answer
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OLSR mobile routing protocol
In OLSR we have the MPR - Multi Point Relays and MS - Multi Point Relay Selector. During the topology control messages flood, each MPR floods its MS set. Based on the MS set info of each node, every ...
3
votes
3
answers
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Detecting 2G/3G/4G Devices [closed]
There are one or two answers that come close to answering this question but they either fall short or go in straight at the deeper end.
Essentially, I am interested (for genuinely academic reasons!) ...
3
votes
3
answers
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Why not all data traffic is going through the 3GDT in 3G data network
What is the reason for only part of the 3G data traffic to be going through the 3G Direct Tunnel and another part is going through the SGSN. There are counters for traffic in IuPS interface which ...
3
votes
1
answer
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Typical 3G data session management
I am trying to understand what constitutes a new data session as listed in a CDR, where the packet switching core is a typical Nokia Siemens setup.
Firstly, are data sessions managed between a phone'...
3
votes
1
answer
182
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Can mobile devices take a global IPv6 address by means of only routing?
I'm probably asking this the wrong way, but here it is; I have a /48 block with static addresses for every device on the network. Everything is routed, no NAT, no tricks.
My question is: on a mobile ...
3
votes
1
answer
551
views
What is the IS-41 location registration process?
I am unsure what the IS-41 location registration process is.
Could someone please explain this?
3
votes
1
answer
3k
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How does "location update" happens in your mobile?
I have learned that your mobile periodically updates it's location when it moves from one location area to another and I learned that some updates will be made to VLR and HLR like in VLR your details ...
3
votes
1
answer
806
views
Cell information in GSM, UMTS, LTE
I'm trying to understand how a Mobile Station get the information about the cell from the BTS or the NodeB. The information I am looking for is :
Mobile Country Code (MCC)
Mobile Network Code (MNC)
...
3
votes
2
answers
221
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Mobile IP in a large-ish IPv4 network
So we are looking into implementing IP mobility in our network.
The use case would be for a laptop to be able to roam between wired and wireless mode of operation while retaining all TCP/UDP based ...
3
votes
1
answer
282
views
In OLSR instead of MS if MPR selector are used, will it work?
In the TC message of OLSR that is created by each node x, x includes its MS set,
i.e., a list of nodes that have selected it as an MPR. Assume instead ...
3
votes
1
answer
595
views
When LTE to UMTS IRAT handover is made, what changes occurs in MAC layer?
I have not been able to figure out any changes in MAC layer. If there doesn't occur any change then please give the reason
2
votes
2
answers
875
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How GSM network routes Internet packets?
How does a GSM network route internet packets? Does GSM use NAT based PAT like a physical Router? For example, user A visits website #1 and user B visits website #2. how data of website #1 are given ...
2
votes
2
answers
350
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long range antenna
we want to provide mobiles and laptops in site B with internet connection using long range antenna, but it is not permitted to put any communication devices (ex. AP) there.
1- is there any ...
2
votes
1
answer
648
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what is the difference between LTE and LTE Band 4?
I see some mobile operators mentioned LTE and some are mentioning LTE with band 4. What is the difference between those two ?
2
votes
1
answer
143
views
How can I log authentication errors in 3G routers?
What command (debug) can I use to see authentication errors on a cisco 3G router specifically for the 3G connection?
2
votes
1
answer
197
views
Is There an Indication in Protocol Stack showing that the End Host is Mobile?
Suppose you are using the Web from your mobile phone. Is there any indication in the internet backbone, when you look at the traffic that shows that the end host is a mobile device?
I am sure there ...
2
votes
2
answers
140
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How common is it for mobile network operators to give the same IPv4 address to different 3G devices?
Do they have to give different IPv4 addresses?
2
votes
2
answers
449
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Why do the majority of probe requests captured have an invalid OUI in their MAC address?
I'm working on replicating some research wherein users were profiled based on the SSIDs they asked for when sending out 802.11 probe requests. I only captured probe requests, so information from ...
2
votes
3
answers
131
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GPRS client identification
I would like to get advice about client identification connected over gprs network. Is it possible to solve identity in simple TCP packet or exist some higher protocol to obtain IMEI? There is many ...
2
votes
3
answers
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Are voice and data transmitted differently?
Most mobile carriers' plans charge voice and data charged separately and differently.
Consider in 2G,3G or 4G networks respectively:
does it mean that voice and data are transmitted differently at ...
2
votes
1
answer
4k
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In which cases is the PDP context terminated
In a mobile network the UE establishes a PDP Context in order to transmit an receive data. In which cases the PDP contexts is terminated.
For example - is it terminated when:
the UE is switched off
...
2
votes
1
answer
823
views
Structural unknown HCI Command in Bluetooth LE logs
I am inspecting the Bluetooth HCI snoop logs as part of debugging an application. For dissecting the logs/Bluetooth LE packets I'm using Wireshark.
I found that there is a recurring unknown command ...
2
votes
2
answers
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How does cellular data differ from an ISP, and what can be tracked?
Are IP addresses given to a phone static or not?
Also, how can phone companies keep track of a person if they wanted to find them? For example, I don't have an account and use a pre-paid card.
I'm ...
2
votes
1
answer
302
views
Does base station electric power consumption depend on the traffic?
It is told that mobile Base Stations consume approximately 1 kW of power non-stop. Meantime I read that watching a movie every week at your mobile phone consumes as much energy by the network as ...
2
votes
1
answer
302
views
RSSI versus available bandwidth, cellular context
In surveying cellular "coverage" over a geographic area, one could record any of several metrics, RSSI and practical bandwidth/throughput (e.g., Speedtest) among them. I understand that RSSI is ...
2
votes
1
answer
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Location Request (MT-LR and MO-LR) ASN.1 messages
I am unable to identify the 3GPP specification that gives me message structure in ASN format for MT-LR and MO-LR. Please let me know about this.
I browsed through many RRLP, RRC, LTE, LPP documents ...
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vote
2
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374
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Do wireless devices such as smartphones transmit beacon equivalent frames such as APs do?
Can they be made to announce their presence somehow using layer 2 frames without them be connected to any network or access point?
Can their MAC address be found?
1
vote
2
answers
120
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When a mobile phone is connected to a wireless mobile network, is it assigned an IP address?
When a mobile phone is connected to a wifi network, it is assigned an IP address.
When it is connected to a wireless mobile network, is it also assigned an IP address?
If yes, in terminal emulator, ...
1
vote
3
answers
264
views
For 2G/GSM networks, are there "portable" cell towers?
Let's suppose I am in the middle of the desert or some kind of jungle, and I have no 2G/GSM Signal. I would like to know if there is any civilian technology (that is or maybe isn't available to the ...
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2
answers
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How does Mobile Number Portability work?
Mobile Number Portability (MNP) is a way to enable mobile phone users to change from one mobile network carrier (the donating network) to another one (the recipient network) while retaining their ...
1
vote
2
answers
266
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I have a bit confusion about the deployment of HSPA?
After many research I found that HSPA share the UMTS 5 Mhz band. However, I have not understood how can these two thechnology share it and why don't operator use only HSPA technology if it can offer ...
1
vote
1
answer
145
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Why do we need to aggregate frames into a multiframe in GSM networks?
I'm struggling to understand the need for frame aggregation into the multiframe and other higher level frames.
What exactly do we gain with the aggregation? Is this for synchronisation purposes across ...
1
vote
2
answers
91
views
Does the cell phone model affect the arrival time of SMS
I am developing an SMS based system, and I was asked if the cell phone model has a significant effect on the arrival time of the SMS. Although, I'm a bit sure it doesn't because of my testing.
I have ...
1
vote
1
answer
288
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Authentication center in GSM
We know that the AuC (Authentication Center) is used to identify GSM subscribers in the case of roaming or when the subscriber is requesting access to mobile network for the first time. But, I'm ...
1
vote
1
answer
89
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How do Cell Modems know the tower Type they are connected to?
I hope this is the right place to ask this question but can someone tell me how a cell modem with network fallback/forward knows what network it is connected too? Is there typically an AT-Command ...
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2
answers
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Does a VPN service "anonymize" a mobile connection just as much as a landline connection?
I recently read about a proposal by the military government in Thailand to make tourist SIM-cards "trackable". That got me thinking about security when accessing the Internet via a mobile connection ...
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1
answer
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Mobile Wireless Technology
Nowadays, most smartphones (or other smart mobiles) have some kind of wireless communication for short range and medium range. For short range, the most widespread technology in use is, probably, WiFi:...